21612286256 has 30 divisors (see below), whose sum is σ = 46026582756. Its totient is φ = 9823765600.

The previous prime is 21612286247. The next prime is 21612286273. The reversal of 21612286256 is 65268221612.

It is a super-2 number, since 2×21612286256² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5579750 + ... + 5583621.

Almost surely, 2^21612286256 is an apocalyptic number.

It is an amenable number.

21612286256 is an abundant number, since it is smaller than the sum of its proper divisors (24414296500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21612286256 is a wasteful number, since it uses less digits than its factorization.

21612286256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11163401 (or 11163384 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The spelling of 21612286256 in words is "twenty-one billion, six hundred twelve million, two hundred eighty-six thousand, two hundred fifty-six".