21662611128 has 48 divisors (see below), whose sum is σ = 58677582600. Its totient is φ = 7219884480.

The previous prime is 21662611109. The next prime is 21662611147. The reversal of 21662611128 is 82111626612.

It is a happy number.

21662611128 is a `hidden beast` number, since 2 + 1 + 6 + 626 + 1 + 1 + 1 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (21662611109) and next prime (21662611147).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21662611092 and 21662611101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 671038 + ... + 702578.

Almost surely, 2^21662611128 is an apocalyptic number.

It is an amenable number.

21662611128 is an abundant number, since it is smaller than the sum of its proper divisors (37014971472).

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

21662611128 is a wasteful number, since it uses less digits than its factorization.

21662611128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41092 (or 41085 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The spelling of 21662611128 in words is "twenty-one billion, six hundred sixty-two million, six hundred eleven thousand, one hundred twenty-eight".