21051235296 has 144 divisors (see below), whose sum is σ = 73679415264. Its totient is φ = 5551967232.

The previous prime is 21051235279. The next prime is 21051235297. The reversal of 21051235296 is 69253215012.

It is a happy number.

21051235296 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 123 + 529 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21051235296.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051235297) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 375411 + ... + 427826.

It is an arithmetic number, because the mean of its divisors is an integer number (511662606).

Almost surely, 2^21051235296 is an apocalyptic number.

21051235296 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21051235296 is an abundant number, since it is smaller than the sum of its proper divisors (52628179968).

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

21051235296 is a wasteful number, since it uses less digits than its factorization.

21051235296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803273 (or 803262 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 21051235296 in words is "twenty-one billion, fifty-one million, two hundred thirty-five thousand, two hundred ninety-six".