21704641044 has 12 divisors (see below), whose sum is σ = 50644162464. Its totient is φ = 7234880344.

The previous prime is 21704641039. The next prime is 21704641061. The reversal of 21704641044 is 44014640712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21704640996 and 21704641014.

It is a congruent number.

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, 904360032 + ... + 904360055.

It is an arithmetic number, because the mean of its divisors is an integer number (4220346872).

Almost surely, 2^21704641044 is an apocalyptic number.

It is an amenable number.

21704641044 is an abundant number, since it is smaller than the sum of its proper divisors (28939521420).

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

21704641044 is a wasteful number, since it uses less digits than its factorization.

21704641044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808720094 (or 1808720092 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The spelling of 21704641044 in words is "twenty-one billion, seven hundred four million, six hundred forty-one thousand, forty-four".