21170733764 has 24 divisors (see below), whose sum is σ = 37834473600. Its totient is φ = 10362386720.

The previous prime is 21170733763. The next prime is 21170733781. The reversal of 21170733764 is 46733707112.

It is not an unprimeable number, because it can be changed into a prime (21170733763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131267 + ... + 244074.

It is an arithmetic number, because the mean of its divisors is an integer number (1576436400).

Almost surely, 2^21170733764 is an apocalyptic number.

It is an amenable number.

21170733764 is a deficient number, since it is larger than the sum of its proper divisors (16663739836).

21170733764 is a wasteful number, since it uses less digits than its factorization.

21170733764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375643 (or 375641 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 41.

The spelling of 21170733764 in words is "twenty-one billion, one hundred seventy million, seven hundred thirty-three thousand, seven hundred sixty-four".