20131121312 has 24 divisors (see below), whose sum is σ = 41356326816. Its totient is φ = 9627927232.

The previous prime is 20131121291. The next prime is 20131121321. The reversal of 20131121312 is 21312113102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13675298 + ... + 13676769.

It is an arithmetic number, because the mean of its divisors is an integer number (1723180284).

Almost surely, 2^20131121312 is an apocalyptic number.

It is an amenable number.

20131121312 is an abundant number, since it is smaller than the sum of its proper divisors (21225205504).

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

20131121312 is a wasteful number, since it uses less digits than its factorization.

20131121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27352100 (or 27352092 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20131121312 its reverse (21312113102), we get a palindrome (41443234414).

The spelling of 20131121312 in words is "twenty billion, one hundred thirty-one million, one hundred twenty-one thousand, three hundred twelve".