21150736256 has 64 divisors (see below), whose sum is σ = 46484398800. Its totient is φ = 9523752960.

The previous prime is 21150736253. The next prime is 21150736259. The reversal of 21150736256 is 65263705112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21150736253) and next prime (21150736259).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150736253) 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, 86786 + ... + 223233.

Almost surely, 2^21150736256 is an apocalyptic number.

21150736256 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21150736256 is an abundant number, since it is smaller than the sum of its proper divisors (25333662544).

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

21150736256 is a wasteful number, since it uses less digits than its factorization.

21150736256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310087 (or 310075 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 21150736256 in words is "twenty-one billion, one hundred fifty million, seven hundred thirty-six thousand, two hundred fifty-six".