21646049604 has 24 divisors (see below), whose sum is σ = 50668823520. Its totient is φ = 7192296384.

The previous prime is 21646049597. The next prime is 21646049641. The reversal of 21646049604 is 40694064612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2877774 + ... + 2885285.

It is an arithmetic number, because the mean of its divisors is an integer number (2111200980).

Almost surely, 2^21646049604 is an apocalyptic number.

It is an amenable number.

21646049604 is an abundant number, since it is smaller than the sum of its proper divisors (29022773916).

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

21646049604 is a wasteful number, since it uses less digits than its factorization.

21646049604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5763379 (or 5763377 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 21646049604 in words is "twenty-one billion, six hundred forty-six million, forty-nine thousand, six hundred four".