2125151222121 has 40 divisors (see below), whose sum is σ = 3222434286720. Its totient is φ = 1395476123328.

The previous prime is 2125151222081. The next prime is 2125151222143. The reversal of 2125151222121 is 1212221515212.

It is a happy number.

2125151222121 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 1 + 512 + 22 + 121 = 666.

It is not a de Polignac number, because 2125151222121 - 2²⁵ = 2125117667689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2125151222921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4151500 + ... + 4635218.

It is an arithmetic number, because the mean of its divisors is an integer number (80560857168).

Almost surely, 2^{2125151222121} is an apocalyptic number.

It is an amenable number.

2125151222121 is a deficient number, since it is larger than the sum of its proper divisors (1097283064599).

2125151222121 is an equidigital number, since it uses as much as digits as its factorization.

2125151222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484547 (or 484538 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

Adding to 2125151222121 its reverse (1212221515212), we get a palindrome (3337372737333).

The spelling of 2125151222121 in words is "two trillion, one hundred twenty-five billion, one hundred fifty-one million, two hundred twenty-two thousand, one hundred twenty-one".