2121311431504 has 40 divisors (see below), whose sum is σ = 4222632318560. Its totient is φ = 1031620364928.

The previous prime is 2121311431433. The next prime is 2121311431517. The reversal of 2121311431504 is 4051341131212.

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, 1020187 + ... + 2298565.

It is an arithmetic number, because the mean of its divisors is an integer number (105565807964).

Almost surely, 2^{2121311431504} is an apocalyptic number.

It is an amenable number.

2121311431504 is a deficient number, since it is larger than the sum of its proper divisors (2101320887056).

2121311431504 is a wasteful number, since it uses less digits than its factorization.

2121311431504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281227 (or 1281221 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 2121311431504 its reverse (4051341131212), we get a palindrome (6172652562716).

The spelling of 2121311431504 in words is "two trillion, one hundred twenty-one billion, three hundred eleven million, four hundred thirty-one thousand, five hundred four".