Base | Representation |
---|---|
bin | 1001100110011010100001… |
… | …10111111110101111010101 |
3 | 2202202012111022212022002022 |
4 | 10303031100313332233111 |
5 | 10231341034001041041 |
6 | 112522152023422525 |
7 | 4306141155444353 |
oct | 463152067765725 |
9 | 82665438768068 |
10 | 21111121112021 |
11 | 67aa1a35580a6 |
12 | 244b5878b4a45 |
13 | ba1a0210c765 |
14 | 52dad87207d3 |
15 | 269236d4b24b |
hex | 133350dfebd5 |
21111121112021 has 2 divisors, whose sum is σ = 21111121112022. Its totient is φ = 21111121112020.
The previous prime is 21111121111967. The next prime is 21111121112047. The reversal of 21111121112021 is 12021112111112.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 16966696474225 + 4144424637796 = 4119065^2 + 2035786^2 .
It is a cyclic number.
It is not a de Polignac number, because 21111121112021 - 26 = 21111121111957 is a prime.
It is a super-3 number, since 3×211111211120213 (a number of 41 digits) contains 333 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (21111123112021) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555560556010 + 10555560556011.
It is an arithmetic number, because the mean of its divisors is an integer number (10555560556011).
Almost surely, 221111121112021 is an apocalyptic number.
It is an amenable number.
21111121112021 is a deficient number, since it is larger than the sum of its proper divisors (1).
21111121112021 is an equidigital number, since it uses as much as digits as its factorization.
21111121112021 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 16, while the sum is 17.
Adding to 21111121112021 its reverse (12021112111112), we get a palindrome (33132233223133).
Subtracting from 21111121112021 its reverse (12021112111112), we obtain a palindrome (9090009000909).
The spelling of 21111121112021 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, twenty-one".
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