21622711552 has 36 divisors (see below), whose sum is σ = 46481040340. Its totient is φ = 9979711488.

The previous prime is 21622711549. The next prime is 21622711559. The reversal of 21622711552 is 25511722612.

It can be written as a sum of positive squares in 2 ways, for example, as 14174331136 + 7448380416 = 119056^2 + 86304^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622711559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3245277 + ... + 3251932.

Almost surely, 2^21622711552 is an apocalyptic number.

It is an amenable number.

21622711552 is an abundant number, since it is smaller than the sum of its proper divisors (24858328788).

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

21622711552 is an equidigital number, since it uses as much as digits as its factorization.

21622711552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6497238 (or 6497224 counting only the distinct ones).

The product of its digits is 16800, while the sum is 34.

The spelling of 21622711552 in words is "twenty-one billion, six hundred twenty-two million, seven hundred eleven thousand, five hundred fifty-two".