21010866903474 has 32 divisors (see below), whose sum is σ = 48032925557760. Its totient is φ = 6002093964432.

The previous prime is 21010866903473. The next prime is 21010866903511. The reversal of 21010866903474 is 47430966801012.

It is a happy number.

It is a super-2 number, since 2×21010866903474² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21010866903473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41866974 + ... + 42365849.

It is an arithmetic number, because the mean of its divisors is an integer number (1501028923680).

Almost surely, 2^{21010866903474} is an apocalyptic number.

21010866903474 is an abundant number, since it is smaller than the sum of its proper divisors (27022058654286).

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

21010866903474 is a wasteful number, since it uses less digits than its factorization.

21010866903474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84238774.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 21010866903474 in words is "twenty-one trillion, ten billion, eight hundred sixty-six million, nine hundred three thousand, four hundred seventy-four".