21229429567872 has 64 divisors (see below), whose sum is σ = 58842440674560. Its totient is φ = 6768803627520.

The previous prime is 21229429567817. The next prime is 21229429567883. The reversal of 21229429567872 is 27876592492212.

It is a tau number, because it is divible by the number of its divisors (64).

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, 1201838404 + ... + 1201856067.

It is an arithmetic number, because the mean of its divisors is an integer number (919413135540).

Almost surely, 2^{21229429567872} is an apocalyptic number.

It is an amenable number.

21229429567872 is an abundant number, since it is smaller than the sum of its proper divisors (37613011106688).

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

21229429567872 is a wasteful number, since it uses less digits than its factorization.

21229429567872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403694511 (or 2403694499 counting only the distinct ones).

The product of its digits is 121927680, while the sum is 66.

The spelling of 21229429567872 in words is "twenty-one trillion, two hundred twenty-nine billion, four hundred twenty-nine million, five hundred sixty-seven thousand, eight hundred seventy-two".