12131212021100 has 72 divisors (see below), whose sum is σ = 27274574003040. Its totient is φ = 4677915665920.

The previous prime is 12131212021081. The next prime is 12131212021151. The reversal of 12131212021100 is 112021213121.

It is a happy number.

It is a super-2 number, since 2×12131212021100² (a number of 27 digits) contains 22 as substring.

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, 1356449 + ... + 5109048.

It is an arithmetic number, because the mean of its divisors is an integer number (378813527820).

Almost surely, 2^{12131212021100} is an apocalyptic number.

12131212021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131212021100 is an abundant number, since it is smaller than the sum of its proper divisors (15143361981940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12131212021100 is a wasteful number, since it uses less digits than its factorization.

12131212021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6466187 (or 6466180 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 12131212021100 its reverse (112021213121), we get a palindrome (12243233234221).

The spelling of 12131212021100 in words is "twelve trillion, one hundred thirty-one billion, two hundred twelve million, twenty-one thousand, one hundred".