12020211525 has 24 divisors (see below), whose sum is σ = 22712476864. Its totient is φ = 5494953600.

The previous prime is 12020211503. The next prime is 12020211563. The reversal of 12020211525 is 52511202021.

It is not a de Polignac number, because 12020211525 - 2⁶ = 12020211461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11447296 + ... + 11448345.

Almost surely, 2^12020211525 is an apocalyptic number.

12020211525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12020211525 is a deficient number, since it is larger than the sum of its proper divisors (10692265339).

12020211525 is a wasteful number, since it uses less digits than its factorization.

12020211525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22895661 (or 22895656 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 12020211525 its reverse (52511202021), we get a palindrome (64531413546).

The spelling of 12020211525 in words is "twelve billion, twenty million, two hundred eleven thousand, five hundred twenty-five".