21662064126 has 24 divisors (see below), whose sum is σ = 47005718760. Its totient is φ = 7209727056.

The previous prime is 21662064113. The next prime is 21662064133. The reversal of 21662064126 is 62146026612.

21662064126 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 2 + 0 + 641 + 2 + 6 = 666.

It is a super-2 number, since 2×21662064126² (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 11 ways as a sum of consecutive naturals, for example, 901225 + ... + 924948.

It is an arithmetic number, because the mean of its divisors is an integer number (1958571615).

Almost surely, 2^21662064126 is an apocalyptic number.

21662064126 is an abundant number, since it is smaller than the sum of its proper divisors (25343654634).

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

21662064126 is a wasteful number, since it uses less digits than its factorization.

21662064126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826840 (or 1826837 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21662064126 in words is "twenty-one billion, six hundred sixty-two million, sixty-four thousand, one hundred twenty-six".