21909432820952 has 16 divisors (see below), whose sum is σ = 43242301620600. Its totient is φ = 10378152388800.

The previous prime is 21909432820903. The next prime is 21909432820967. The reversal of 21909432820952 is 25902823490912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72070502549 + ... + 72070502852.

Almost surely, 2^{21909432820952} is an apocalyptic number.

It is an amenable number.

21909432820952 is a deficient number, since it is larger than the sum of its proper divisors (21332868799648).

21909432820952 is a wasteful number, since it uses less digits than its factorization.

21909432820952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144141005426 (or 144141005422 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 21909432820952 in words is "twenty-one trillion, nine hundred nine billion, four hundred thirty-two million, eight hundred twenty thousand, nine hundred fifty-two".