251314662121 has 4 divisors (see below), whose sum is σ = 251349685972. Its totient is φ = 251279638272.

The previous prime is 251314662103. The next prime is 251314662149. The reversal of 251314662121 is 121266413152.

251314662121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 240037284096 + 11277378025 = 489936^2 + 106195^2 .

It is a cyclic number.

It is not a de Polignac number, because 251314662121 - 2¹⁵ = 251314629353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251314662421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17501160 + ... + 17515513.

It is an arithmetic number, because the mean of its divisors is an integer number (62837421493).

Almost surely, 2^251314662121 is an apocalyptic number.

It is an amenable number.

251314662121 is a deficient number, since it is larger than the sum of its proper divisors (35023851).

251314662121 is an equidigital number, since it uses as much as digits as its factorization.

251314662121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35023850.

The product of its digits is 17280, while the sum is 34.

The spelling of 251314662121 in words is "two hundred fifty-one billion, three hundred fourteen million, six hundred sixty-two thousand, one hundred twenty-one".