21621411422472 has 32 divisors (see below), whose sum is σ = 54053929987200. Its totient is φ = 7207083616704.

The previous prime is 21621411422411. The next prime is 21621411422489. The reversal of 21621411422472 is 27422411412612.

It is a self number, because there is not a number n which added to its sum of digits gives 21621411422472.

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, 22929 + ... + 6575967.

It is an arithmetic number, because the mean of its divisors is an integer number (1689185312100).

Almost surely, 2^{21621411422472} is an apocalyptic number.

It is an amenable number.

21621411422472 is an abundant number, since it is smaller than the sum of its proper divisors (32432518564728).

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

21621411422472 is a wasteful number, since it uses less digits than its factorization.

21621411422472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690525 (or 6690521 counting only the distinct ones).

The product of its digits is 86016, while the sum is 39.

The spelling of 21621411422472 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, four hundred seventy-two".