21371370834724 has 27 divisors (see below), whose sum is σ = 37553574102961. Its totient is φ = 10641957236000.

The previous prime is 21371370834691. The next prime is 21371370834743. The reversal of 21371370834724 is 42743807317312.

It is a happy number.

The square root of 21371370834724 is 4622918.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3249662393124 + 18121708441600 = 1802682^2 + 4256960^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2320700232 + ... + 2320709440.

Almost surely, 2^{21371370834724} is an apocalyptic number.

21371370834724 is the 4622918-th square number.

It is an amenable number.

21371370834724 is a deficient number, since it is larger than the sum of its proper divisors (16182203268237).

21371370834724 is an frugal number, since it uses more digits than its factorization.

21371370834724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18924 (or 9462 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 52.

The spelling of 21371370834724 in words is "twenty-one trillion, three hundred seventy-one billion, three hundred seventy million, eight hundred thirty-four thousand, seven hundred twenty-four".