21699018804 has 24 divisors (see below), whose sum is σ = 50660074528. Its totient is φ = 7228859040.

The previous prime is 21699018787. The next prime is 21699018821. The reversal of 21699018804 is 40881099612.

It is an interprime number because it is at equal distance from previous prime (21699018787) and next prime (21699018821).

It is a congruent number.

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, 496567 + ... + 538494.

Almost surely, 2^21699018804 is an apocalyptic number.

It is an amenable number.

21699018804 is an abundant number, since it is smaller than the sum of its proper divisors (28961055724).

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

21699018804 is a wasteful number, since it uses less digits than its factorization.

21699018804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036815 (or 1036813 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 21699018804 in words is "twenty-one billion, six hundred ninety-nine million, eighteen thousand, eight hundred four".