2131121312305 has 16 divisors (see below), whose sum is σ = 2700434681280. Its totient is φ = 1610070443712.

The previous prime is 2131121312263. The next prime is 2131121312371. The reversal of 2131121312305 is 5032131211312.

It is a cyclic number.

It is not a de Polignac number, because 2131121312305 - 2²⁹ = 2130584441393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131121312305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35352939 + ... + 35413168.

It is an arithmetic number, because the mean of its divisors is an integer number (168777167580).

Almost surely, 2^{2131121312305} is an apocalyptic number.

It is an amenable number.

2131121312305 is a deficient number, since it is larger than the sum of its proper divisors (569313368975).

2131121312305 is a wasteful number, since it uses less digits than its factorization.

2131121312305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70766448.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 2131121312305 its reverse (5032131211312), we get a palindrome (7163252523617).

The spelling of 2131121312305 in words is "two trillion, one hundred thirty-one billion, one hundred twenty-one million, three hundred twelve thousand, three hundred five".