131221132012 has 6 divisors (see below), whose sum is σ = 229636981028. Its totient is φ = 65610566004.

The previous prime is 131221131991. The next prime is 131221132027. The reversal of 131221132012 is 210231122131.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16402641498 + ... + 16402641505.

Almost surely, 2^131221132012 is an apocalyptic number.

It is an amenable number.

131221132012 is a deficient number, since it is larger than the sum of its proper divisors (98415849016).

131221132012 is a wasteful number, since it uses less digits than its factorization.

131221132012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32805283007 (or 32805283005 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 131221132012 its reverse (210231122131), we get a palindrome (341452254143).

The spelling of 131221132012 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, twelve".