2121122525 has 24 divisors (see below), whose sum is σ = 2675480544. Its totient is φ = 1667931200.

The previous prime is 2121122503. The next prime is 2121122527. The reversal of 2121122525 is 5252211212.

It is not a de Polignac number, because 2121122525 - 2⁶ = 2121122461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121122525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121122527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347399 + ... + 353451.

It is an arithmetic number, because the mean of its divisors is an integer number (111478356).

Almost surely, 2^2121122525 is an apocalyptic number.

2121122525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121122525 is a deficient number, since it is larger than the sum of its proper divisors (554358019).

2121122525 is a wasteful number, since it uses less digits than its factorization.

2121122525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6301 (or 6296 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 2121122525 is about 46055.6459622488. The cubic root of 2121122525 is about 1284.8583521639.

Adding to 2121122525 its reverse (5252211212), we get a palindrome (7373333737).

The spelling of 2121122525 in words is "two billion, one hundred twenty-one million, one hundred twenty-two thousand, five hundred twenty-five".