21931314135784 has 32 divisors (see below), whose sum is σ = 42919613856000. Its totient is φ = 10486317573952.

The previous prime is 21931314135763. The next prime is 21931314135811. The reversal of 21931314135784 is 48753141313912.

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, 13859899 + ... + 15360970.

It is an arithmetic number, because the mean of its divisors is an integer number (1341237933000).

Almost surely, 2^{21931314135784} is an apocalyptic number.

It is an amenable number.

21931314135784 is a deficient number, since it is larger than the sum of its proper divisors (20988299720216).

21931314135784 is a wasteful number, since it uses less digits than its factorization.

21931314135784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29224977 (or 29224973 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The spelling of 21931314135784 in words is "twenty-one trillion, nine hundred thirty-one billion, three hundred fourteen million, one hundred thirty-five thousand, seven hundred eighty-four".