21613745722 has 16 divisors (see below), whose sum is σ = 32839718400. Its totient is φ = 10667245680.

The previous prime is 21613745677. The next prime is 21613745729. The reversal of 21613745722 is 22754731612.

It is not an unprimeable number, because it can be changed into a prime (21613745729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 658804 + ... + 690832.

It is an arithmetic number, because the mean of its divisors is an integer number (2052482400).

Almost surely, 2^21613745722 is an apocalyptic number.

21613745722 is a deficient number, since it is larger than the sum of its proper divisors (11225972678).

21613745722 is a wasteful number, since it uses less digits than its factorization.

21613745722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36381.

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

The spelling of 21613745722 in words is "twenty-one billion, six hundred thirteen million, seven hundred forty-five thousand, seven hundred twenty-two".