21954588804 has 18 divisors (see below), whose sum is σ = 55496321790. Its totient is φ = 7318196256.

The previous prime is 21954588769. The next prime is 21954588847. The reversal of 21954588804 is 40888545912.

21954588804 is a `hidden beast` number, since 2 + 1 + 9 + 54 + 588 + 8 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21794616900 + 159971904 = 147630^2 + 12648^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 304924809 + ... + 304924880.

Almost surely, 2^21954588804 is an apocalyptic number.

It is an amenable number.

21954588804 is an abundant number, since it is smaller than the sum of its proper divisors (33541732986).

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

21954588804 is a wasteful number, since it uses less digits than its factorization.

21954588804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609849699 (or 609849694 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 54.

The spelling of 21954588804 in words is "twenty-one billion, nine hundred fifty-four million, five hundred eighty-eight thousand, eight hundred four".