2125115521 has 4 divisors (see below), whose sum is σ = 2217511872. Its totient is φ = 2032719172.

The previous prime is 2125115519. The next prime is 2125115527. The reversal of 2125115521 is 1255115212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2125115521 - 2¹ = 2125115519 is a prime.

It is a super-2 number, since 2×2125115521² = 9032231955190202882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2125115527) 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, 46198141 + ... + 46198186.

It is an arithmetic number, because the mean of its divisors is an integer number (554377968).

Almost surely, 2^2125115521 is an apocalyptic number.

It is an amenable number.

2125115521 is a deficient number, since it is larger than the sum of its proper divisors (92396351).

2125115521 is an equidigital number, since it uses as much as digits as its factorization.

2125115521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92396350.

The product of its digits is 1000, while the sum is 25.

The square root of 2125115521 is about 46098.9752706066. The cubic root of 2125115521 is about 1285.6640919282.

The spelling of 2125115521 in words is "two billion, one hundred twenty-five million, one hundred fifteen thousand, five hundred twenty-one".