72021313 has 8 divisors (see below), whose sum is σ = 88641728. Its totient is φ = 56983824.

The previous prime is 72021283. The next prime is 72021331. The reversal of 72021313 is 31312027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72021313 - 2²⁵ = 38466881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72021373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395631 + ... + 395812.

It is an arithmetic number, because the mean of its divisors is an integer number (11080216).

Almost surely, 2^72021313 is an apocalyptic number.

It is an amenable number.

72021313 is a deficient number, since it is larger than the sum of its proper divisors (16620415).

72021313 is a wasteful number, since it uses less digits than its factorization.

72021313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791463.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 72021313 is about 8486.5371618818. The cubic root of 72021313 is about 416.0578094741.

It can be divided in two parts, 7202 and 1313, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 72021313 in words is "seventy-two million, twenty-one thousand, three hundred thirteen".