396207850921 has 4 divisors (see below), whose sum is σ = 396282485700. Its totient is φ = 396133216144.

The previous prime is 396207850901. The next prime is 396207850999. The reversal of 396207850921 is 129058702693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117673011225 + 278534839696 = 343035^2 + 527764^2 .

It is a cyclic number.

It is not a de Polignac number, because 396207850921 - 2⁵ = 396207850889 is a prime.

It is a super-2 number, since 2×396207850921² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396207850901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37309426 + ... + 37320043.

It is an arithmetic number, because the mean of its divisors is an integer number (99070621425).

Almost surely, 2^396207850921 is an apocalyptic number.

It is an amenable number.

396207850921 is a deficient number, since it is larger than the sum of its proper divisors (74634779).

396207850921 is an equidigital number, since it uses as much as digits as its factorization.

396207850921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74634778.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 396207850921 in words is "three hundred ninety-six billion, two hundred seven million, eight hundred fifty thousand, nine hundred twenty-one".