21040935712636 has 48 divisors (see below), whose sum is σ = 42100591622656. Its totient is φ = 9013533401664.

The previous prime is 21040935712627. The next prime is 21040935712681. The reversal of 21040935712636 is 63621753904012.

It is a self number, because there is not a number n which added to its sum of digits gives 21040935712636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664008385 + ... + 664040071.

Almost surely, 2^{21040935712636} is an apocalyptic number.

It is an amenable number.

21040935712636 is an abundant number, since it is smaller than the sum of its proper divisors (21059655910020).

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

21040935712636 is a wasteful number, since it uses less digits than its factorization.

21040935712636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41498 (or 41496 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 21040935712636 in words is "twenty-one trillion, forty billion, nine hundred thirty-five million, seven hundred twelve thousand, six hundred thirty-six".