12121043525 has 12 divisors (see below), whose sum is σ = 15044266272. Its totient is φ = 9687691440.

The previous prime is 12121043507. The next prime is 12121043573. The reversal of 12121043525 is 52534012121.

It is not a de Polignac number, because 12121043525 - 2²² = 12116849221 is a prime.

It is a super-2 number, since 2×12121043525² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121043494 and 12121043503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201479 + ... + 254628.

It is an arithmetic number, because the mean of its divisors is an integer number (1253688856).

Almost surely, 2^12121043525 is an apocalyptic number.

It is an amenable number.

12121043525 is a deficient number, since it is larger than the sum of its proper divisors (2923222747).

12121043525 is a wasteful number, since it uses less digits than its factorization.

12121043525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457180 (or 457175 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 12121043525 its reverse (52534012121), we get a palindrome (64655055646).

The spelling of 12121043525 in words is "twelve billion, one hundred twenty-one million, forty-three thousand, five hundred twenty-five".