21437327670538 has 64 divisors (see below), whose sum is σ = 37321083942912. Its totient is φ = 9157485839040.

The previous prime is 21437327670511. The next prime is 21437327670599. The reversal of 21437327670538 is 83507672373412.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 1144318 + ... + 6647113.

It is an arithmetic number, because the mean of its divisors is an integer number (583141936608).

Almost surely, 2^{21437327670538} is an apocalyptic number.

21437327670538 is a deficient number, since it is larger than the sum of its proper divisors (15883756272374).

21437327670538 is a wasteful number, since it uses less digits than its factorization.

21437327670538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7791619.

The product of its (nonzero) digits is 35562240, while the sum is 58.

The spelling of 21437327670538 in words is "twenty-one trillion, four hundred thirty-seven billion, three hundred twenty-seven million, six hundred seventy thousand, five hundred thirty-eight".