21256026352 has 20 divisors (see below), whose sum is σ = 44927510616. Its totient is φ = 9661830080.

The previous prime is 21256026343. The next prime is 21256026409. The reversal of 21256026352 is 25362065212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60386263 + ... + 60386614.

Almost surely, 2^21256026352 is an apocalyptic number.

21256026352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21256026352 is an abundant number, since it is smaller than the sum of its proper divisors (23671484264).

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

21256026352 is a wasteful number, since it uses less digits than its factorization.

21256026352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120772896 (or 120772890 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21256026352 in words is "twenty-one billion, two hundred fifty-six million, twenty-six thousand, three hundred fifty-two".