Base | Representation |
---|---|
bin | 10011110000010101… |
… | …011100010100000101 |
3 | 2000202022011100220020 |
4 | 103300111130110011 |
5 | 321420234201041 |
6 | 13424503125353 |
7 | 1350440132541 |
oct | 236025342405 |
9 | 60668140806 |
10 | 21212022021 |
11 | 8aa56a7113 |
12 | 413ba43859 |
13 | 200081b128 |
14 | 1053264a21 |
15 | 84237d866 |
hex | 4f055c505 |
21212022021 has 8 divisors (see below), whose sum is σ = 29512378560. Its totient is φ = 13526506752.
The previous prime is 21212022019. The next prime is 21212022071. The reversal of 21212022021 is 12022021212.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 21212022021 - 21 = 21212022019 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21212022071) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153710236 + ... + 153710373.
It is an arithmetic number, because the mean of its divisors is an integer number (3689047320).
Almost surely, 221212022021 is an apocalyptic number.
It is an amenable number.
21212022021 is a deficient number, since it is larger than the sum of its proper divisors (8300356539).
21212022021 is a wasteful number, since it uses less digits than its factorization.
21212022021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 307420635.
The product of its (nonzero) digits is 64, while the sum is 15.
Adding to 21212022021 its reverse (12022021212), we get a palindrome (33234043233).
It can be divided in two parts, 212 and 12022021, that multiplied together give a palindrome (2548668452).
The spelling of 21212022021 in words is "twenty-one billion, two hundred twelve million, twenty-two thousand, twenty-one".
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