21264868830 has 32 divisors (see below), whose sum is σ = 51067324800. Its totient is φ = 5667116192.

The previous prime is 21264868813. The next prime is 21264868847. The reversal of 21264868830 is 3886846212.

It is an interprime number because it is at equal distance from previous prime (21264868813) and next prime (21264868847).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21264868830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170340 + ... + 267479.

It is an arithmetic number, because the mean of its divisors is an integer number (1595853900).

Almost surely, 2^21264868830 is an apocalyptic number.

21264868830 is an abundant number, since it is smaller than the sum of its proper divisors (29802455970).

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

21264868830 is a wasteful number, since it uses less digits than its factorization.

21264868830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439448.

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 21264868830 in words is "twenty-one billion, two hundred sixty-four million, eight hundred sixty-eight thousand, eight hundred thirty".