Base | Representation |
---|---|
bin | 10011100100111000… |
… | …111110111001001111 |
3 | 2000020220212020211002 |
4 | 103210320332321033 |
5 | 321022110341421 |
6 | 13353443450515 |
7 | 1342616104100 |
oct | 234470767117 |
9 | 60226766732 |
10 | 21020012111 |
11 | 8a0728123a |
12 | 40a7686a3b |
13 | 1c9cb008b7 |
14 | 10359623a7 |
15 | 8305a1b0b |
hex | 4e4e3ee4f |
21020012111 has 12 divisors (see below), whose sum is σ = 24454701792. Its totient is φ = 18015052608.
The previous prime is 21020012099. The next prime is 21020012129. The reversal of 21020012111 is 11121002012.
It is not a de Polignac number, because 21020012111 - 234 = 3840142927 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 21020012092 and 21020012101.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21020012161) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 519146 + ... + 558168.
It is an arithmetic number, because the mean of its divisors is an integer number (2037891816).
Almost surely, 221020012111 is an apocalyptic number.
21020012111 is a deficient number, since it is larger than the sum of its proper divisors (3434689681).
21020012111 is a wasteful number, since it uses less digits than its factorization.
21020012111 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 50030 (or 50023 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 11.
Adding to 21020012111 its reverse (11121002012), we get a palindrome (32141014123).
The spelling of 21020012111 in words is "twenty-one billion, twenty million, twelve thousand, one hundred eleven".
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