399921202129993 has 4 divisors (see below), whose sum is σ = 399925753552260. Its totient is φ = 399916650707728.

The previous prime is 399921202129921. The next prime is 399921202130039.

399921202129993 is nontrivially palindromic in base 10.

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 15988058229049 + 383933143900944 = 3998507^2 + 19594212^2 .

It is a cyclic number.

It is not a de Polignac number, because 399921202129993 - 2²⁵ = 399921168575561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399921202139993) 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, 2275579330 + ... + 2275755067.

It is an arithmetic number, because the mean of its divisors is an integer number (99981438388065).

Almost surely, 2^{399921202129993} is an apocalyptic number.

It is an amenable number.

399921202129993 is a deficient number, since it is larger than the sum of its proper divisors (4551422267).

399921202129993 is an equidigital number, since it uses as much as digits as its factorization.

399921202129993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551422266.

The product of its (nonzero) digits is 76527504, while the sum is 70.

The spelling of 399921202129993 in words is "three hundred ninety-nine trillion, nine hundred twenty-one billion, two hundred two million, one hundred twenty-nine thousand, nine hundred ninety-three".