21162765822 has 16 divisors (see below), whose sum is σ = 46173307392. Its totient is φ = 6412959320.

The previous prime is 21162765739. The next prime is 21162765847. The reversal of 21162765822 is 22856726112.

It is a super-2 number, since 2×21162765822² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160323918 + ... + 160324049.

It is an arithmetic number, because the mean of its divisors is an integer number (2885831712).

Almost surely, 2^21162765822 is an apocalyptic number.

21162765822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21162765822 is an abundant number, since it is smaller than the sum of its proper divisors (25010541570).

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

21162765822 is a wasteful number, since it uses less digits than its factorization.

21162765822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320647983.

The product of its digits is 161280, while the sum is 42.

The spelling of 21162765822 in words is "twenty-one billion, one hundred sixty-two million, seven hundred sixty-five thousand, eight hundred twenty-two".