399320253121 has 4 divisors (see below), whose sum is σ = 404131340592. Its totient is φ = 394509165652.

The previous prime is 399320253109. The next prime is 399320253127. The reversal of 399320253121 is 121352023993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399320253121 - 2¹¹ = 399320251073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399320253127) 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, 2405543611 + ... + 2405543776.

It is an arithmetic number, because the mean of its divisors is an integer number (101032835148).

Almost surely, 2^399320253121 is an apocalyptic number.

It is an amenable number.

399320253121 is a deficient number, since it is larger than the sum of its proper divisors (4811087471).

399320253121 is an equidigital number, since it uses as much as digits as its factorization.

399320253121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4811087470.

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 399320253121 in words is "three hundred ninety-nine billion, three hundred twenty million, two hundred fifty-three thousand, one hundred twenty-one".