251117107122011 has 4 divisors (see below), whose sum is σ = 270433807669872. Its totient is φ = 231800406574152.

The previous prime is 251117107121987. The next prime is 251117107122017. The reversal of 251117107122011 is 110221701711152.

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

It is not a de Polignac number, because 251117107122011 - 2⁴² = 246719060610907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251117107122017) 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, 9658350273911 + ... + 9658350273936.

It is an arithmetic number, because the mean of its divisors is an integer number (67608451917468).

Almost surely, 2^{251117107122011} is an apocalyptic number.

251117107122011 is a deficient number, since it is larger than the sum of its proper divisors (19316700547861).

251117107122011 is a wasteful number, since it uses less digits than its factorization.

251117107122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19316700547860.

The product of its (nonzero) digits is 1960, while the sum is 32.

Adding to 251117107122011 its reverse (110221701711152), we get a palindrome (361338808833163).

The spelling of 251117107122011 in words is "two hundred fifty-one trillion, one hundred seventeen billion, one hundred seven million, one hundred twenty-two thousand, eleven".