21615560722 has 32 divisors (see below), whose sum is σ = 37180166400. Its totient is φ = 9232641600.

The previous prime is 21615560719. The next prime is 21615560723. The reversal of 21615560722 is 22706551612.

It is a super-2 number, since 2×21615560722² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21615560723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5876748 + ... + 5880424.

It is an arithmetic number, because the mean of its divisors is an integer number (1161880200).

Almost surely, 2^21615560722 is an apocalyptic number.

21615560722 is a deficient number, since it is larger than the sum of its proper divisors (15564605678).

21615560722 is a wasteful number, since it uses less digits than its factorization.

21615560722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 21615560722 in words is "twenty-one billion, six hundred fifteen million, five hundred sixty thousand, seven hundred twenty-two".