21759120898 has 16 divisors (see below), whose sum is σ = 32986500120. Its totient is φ = 10763698176.

The previous prime is 21759120883. The next prime is 21759120907. The reversal of 21759120898 is 89802195712.

It can be written as a sum of positive squares in 4 ways, for example, as 21471920089 + 287200809 = 146533^2 + 16947^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597090 + ... + 632482.

Almost surely, 2^21759120898 is an apocalyptic number.

21759120898 is a deficient number, since it is larger than the sum of its proper divisors (11227379222).

21759120898 is a wasteful number, since it uses less digits than its factorization.

21759120898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38661.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 21759120898 in words is "twenty-one billion, seven hundred fifty-nine million, one hundred twenty thousand, eight hundred ninety-eight".