21501754074664 has 16 divisors (see below), whose sum is σ = 40801521287520. Its totient is φ = 10621348398000.

The previous prime is 21501754074659. The next prime is 21501754074679. The reversal of 21501754074664 is 46647045710512.

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, 16191079212 + ... + 16191080539.

It is an arithmetic number, because the mean of its divisors is an integer number (2550095080470).

Almost surely, 2^{21501754074664} is an apocalyptic number.

It is an amenable number.

21501754074664 is a deficient number, since it is larger than the sum of its proper divisors (19299767212856).

21501754074664 is a wasteful number, since it uses less digits than its factorization.

21501754074664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32382159840 (or 32382159836 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 52.

The spelling of 21501754074664 in words is "twenty-one trillion, five hundred one billion, seven hundred fifty-four million, seventy-four thousand, six hundred sixty-four".