21101769664 has 28 divisors (see below), whose sum is σ = 44077712200. Its totient is φ = 9995574528.

The previous prime is 21101769659. The next prime is 21101769671. The reversal of 21101769664 is 46696710112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101769664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8675499 + ... + 8677930.

Almost surely, 2^21101769664 is an apocalyptic number.

It is an amenable number.

21101769664 is an abundant number, since it is smaller than the sum of its proper divisors (22975942536).

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

21101769664 is a wasteful number, since it uses less digits than its factorization.

21101769664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17353460 (or 17353450 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 21101769664 in words is "twenty-one billion, one hundred one million, seven hundred sixty-nine thousand, six hundred sixty-four".