21091949859204 has 72 divisors (see below), whose sum is σ = 62418453272448. Its totient is φ = 5879289156480.

The previous prime is 21091949859179. The next prime is 21091949859223. The reversal of 21091949859204 is 40295894919012.

21091949859204 is a `hidden beast` number, since 2 + 1 + 0 + 91 + 9 + 498 + 59 + 2 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1020699592 + ... + 1020720255.

Almost surely, 2^{21091949859204} is an apocalyptic number.

It is an amenable number.

21091949859204 is an abundant number, since it is smaller than the sum of its proper divisors (41326503413244).

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

21091949859204 is a wasteful number, since it uses less digits than its factorization.

21091949859204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041419905 (or 2041419900 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 63.

The spelling of 21091949859204 in words is "twenty-one trillion, ninety-one billion, nine hundred forty-nine million, eight hundred fifty-nine thousand, two hundred four".