21758904718 has 4 divisors (see below), whose sum is σ = 32638357080. Its totient is φ = 10879452358.

The previous prime is 21758904703. The next prime is 21758904749. The reversal of 21758904718 is 81740985712.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5439726178 + ... + 5439726181.

It is an arithmetic number, because the mean of its divisors is an integer number (8159589270).

Almost surely, 2^21758904718 is an apocalyptic number.

21758904718 is a deficient number, since it is larger than the sum of its proper divisors (10879452362).

21758904718 is a wasteful number, since it uses less digits than its factorization.

21758904718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10879452361.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 21758904718 in words is "twenty-one billion, seven hundred fifty-eight million, nine hundred four thousand, seven hundred eighteen".