12131221404 has 24 divisors (see below), whose sum is σ = 28964467840. Its totient is φ = 3949699824.

The previous prime is 12131221387. The next prime is 12131221411. The reversal of 12131221404 is 40412213121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11754544 + ... + 11755575.

Almost surely, 2^12131221404 is an apocalyptic number.

It is an amenable number.

12131221404 is an abundant number, since it is smaller than the sum of its proper divisors (16833246436).

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

12131221404 is a wasteful number, since it uses less digits than its factorization.

12131221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23510169 (or 23510167 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 12131221404 its reverse (40412213121), we get a palindrome (52543434525).

The spelling of 12131221404 in words is "twelve billion, one hundred thirty-one million, two hundred twenty-one thousand, four hundred four".