21761308722 has 32 divisors (see below), whose sum is σ = 45870955200. Its totient is φ = 6863341248.

The previous prime is 21761308697. The next prime is 21761308747. The reversal of 21761308722 is 22780316712.

It is an interprime number because it is at equal distance from previous prime (21761308697) and next prime (21761308747).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 28897 + ... + 210612.

It is an arithmetic number, because the mean of its divisors is an integer number (1433467350).

Almost surely, 2^21761308722 is an apocalyptic number.

21761308722 is an abundant number, since it is smaller than the sum of its proper divisors (24109646478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21761308722 is a wasteful number, since it uses less digits than its factorization.

21761308722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240330.

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 21761308722 in words is "twenty-one billion, seven hundred sixty-one million, three hundred eight thousand, seven hundred twenty-two".