21717880404 has 24 divisors (see below), whose sum is σ = 55281877728. Its totient is φ = 6581175840.

The previous prime is 21717880391. The next prime is 21717880411. The reversal of 21717880404 is 40408871712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82264567 + ... + 82264830.

It is an arithmetic number, because the mean of its divisors is an integer number (2303411572).

Almost surely, 2^21717880404 is an apocalyptic number.

It is an amenable number.

21717880404 is an abundant number, since it is smaller than the sum of its proper divisors (33563997324).

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

21717880404 is a wasteful number, since it uses less digits than its factorization.

21717880404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164529415 (or 164529413 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 42.

The spelling of 21717880404 in words is "twenty-one billion, seven hundred seventeen million, eight hundred eighty thousand, four hundred four".