21072005268 has 48 divisors (see below), whose sum is σ = 50482481280. Its totient is φ = 6837004800.

The previous prime is 21072005263. The next prime is 21072005281. The reversal of 21072005268 is 86250027012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21072005263) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 167208 + ... + 264768.

It is an arithmetic number, because the mean of its divisors is an integer number (1051718360).

Almost surely, 2^21072005268 is an apocalyptic number.

It is an amenable number.

21072005268 is an abundant number, since it is smaller than the sum of its proper divisors (29410476012).

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

21072005268 is a wasteful number, since it uses less digits than its factorization.

21072005268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98048 (or 98046 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

It can be divided in two parts, 2107200 and 5268, that multiplied together give a square (11100729600 = 105360²).

The spelling of 21072005268 in words is "twenty-one billion, seventy-two million, five thousand, two hundred sixty-eight".