21689403468432 has 160 divisors (see below), whose sum is σ = 65903338963968. Its totient is φ = 6017868476928.

The previous prime is 21689403468407. The next prime is 21689403468443. The reversal of 21689403468432 is 23486430498612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1839238 + ... + 6838245.

Almost surely, 2^{21689403468432} is an apocalyptic number.

It is an amenable number.

21689403468432 is an abundant number, since it is smaller than the sum of its proper divisors (44213935495536).

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

21689403468432 is a wasteful number, since it uses less digits than its factorization.

21689403468432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8677717 (or 8677711 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 60.

The spelling of 21689403468432 in words is "twenty-one trillion, six hundred eighty-nine billion, four hundred three million, four hundred sixty-eight thousand, four hundred thirty-two".