21701497164 has 24 divisors (see below), whose sum is σ = 50901946368. Its totient is φ = 7195958160.

The previous prime is 21701497151. The next prime is 21701497219. The reversal of 21701497164 is 46179410712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4731892 + ... + 4736475.

It is an arithmetic number, because the mean of its divisors is an integer number (2120914432).

Almost surely, 2^21701497164 is an apocalyptic number.

It is an amenable number.

21701497164 is an abundant number, since it is smaller than the sum of its proper divisors (29200449204).

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

21701497164 is a wasteful number, since it uses less digits than its factorization.

21701497164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9468565 (or 9468563 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 21701497164 in words is "twenty-one billion, seven hundred one million, four hundred ninety-seven thousand, one hundred sixty-four".