21758904704 has 32 divisors (see below), whose sum is σ = 43453907400. Its totient is φ = 10852826112.

The previous prime is 21758904703. The next prime is 21758904749. The reversal of 21758904704 is 40740985712.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21758904701) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 155462 + ... + 260165.

Almost surely, 2^21758904704 is an apocalyptic number.

It is an amenable number.

21758904704 is a deficient number, since it is larger than the sum of its proper divisors (21695002696).

21758904704 is an equidigital number, since it uses as much as digits as its factorization.

21758904704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416050 (or 416038 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 21758904704 in words is "twenty-one billion, seven hundred fifty-eight million, nine hundred four thousand, seven hundred four".