21455841904 has 20 divisors (see below), whose sum is σ = 47509364464. Its totient is φ = 9195360768.

The previous prime is 21455841887. The next prime is 21455841907. The reversal of 21455841904 is 40914855412.

It is a super-3 number, since 3×21455841904³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455841907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95784897 + ... + 95785120.

Almost surely, 2^21455841904 is an apocalyptic number.

It is an amenable number.

21455841904 is an abundant number, since it is smaller than the sum of its proper divisors (26053522560).

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

21455841904 is a wasteful number, since it uses less digits than its factorization.

21455841904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191570032 (or 191570026 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 21455841904 in words is "twenty-one billion, four hundred fifty-five million, eight hundred forty-one thousand, nine hundred four".