400015313121 has 16 divisors (see below), whose sum is σ = 535841095680. Its totient is φ = 265434269520.

The previous prime is 400015313111. The next prime is 400015313161. The reversal of 400015313121 is 121313510004.

It is a de Polignac number, because none of the positive numbers 2^k-400015313121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400015313111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1381446 + ... + 1645728.

It is an arithmetic number, because the mean of its divisors is an integer number (33490068480).

Almost surely, 2^400015313121 is an apocalyptic number.

It is an amenable number.

400015313121 is a deficient number, since it is larger than the sum of its proper divisors (135825782559).

400015313121 is a wasteful number, since it uses less digits than its factorization.

400015313121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266636.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 400015313121 its reverse (121313510004), we get a palindrome (521328823125).

The spelling of 400015313121 in words is "four hundred billion, fifteen million, three hundred thirteen thousand, one hundred twenty-one".