21986218662 has 32 divisors (see below), whose sum is σ = 45192751872. Its totient is φ = 7125633504.

The previous prime is 21986218603. The next prime is 21986218663. The reversal of 21986218662 is 26681268912.

It is a happy number.

It is a super-2 number, since 2×21986218662² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21986218663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287013 + ... + 355455.

It is an arithmetic number, because the mean of its divisors is an integer number (1412273496).

Almost surely, 2^21986218662 is an apocalyptic number.

21986218662 is an abundant number, since it is smaller than the sum of its proper divisors (23206533210).

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

21986218662 is a wasteful number, since it uses less digits than its factorization.

21986218662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69932.

The product of its digits is 995328, while the sum is 51.

The spelling of 21986218662 in words is "twenty-one billion, nine hundred eighty-six million, two hundred eighteen thousand, six hundred sixty-two".