21657602722 has 8 divisors (see below), whose sum is σ = 37127318976. Its totient is φ = 9281829732.

The previous prime is 21657602719. The next prime is 21657602749. The reversal of 21657602722 is 22720675612.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 773485798 + ... + 773485825.

It is an arithmetic number, because the mean of its divisors is an integer number (4640914872).

Almost surely, 2^21657602722 is an apocalyptic number.

21657602722 is a deficient number, since it is larger than the sum of its proper divisors (15469716254).

21657602722 is a wasteful number, since it uses less digits than its factorization.

21657602722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546971632.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 21657602722 in words is "twenty-one billion, six hundred fifty-seven million, six hundred two thousand, seven hundred twenty-two".