21662312212989 has 12 divisors (see below), whose sum is σ = 35760007462816. Its totient is φ = 12378464121672.

The previous prime is 21662312212951. The next prime is 21662312213023. The reversal of 21662312212989 is 98921221326612.

21662312212989 is a `hidden beast` number, since 2 + 1 + 6 + 623 + 1 + 2 + 2 + 1 + 2 + 9 + 8 + 9 = 666.

It is not a de Polignac number, because 21662312212989 - 2²⁴ = 21662295435773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21662312217989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171923112739 + ... + 171923112864.

Almost surely, 2^{21662312212989} is an apocalyptic number.

It is an amenable number.

21662312212989 is a deficient number, since it is larger than the sum of its proper divisors (14097695249827).

21662312212989 is a wasteful number, since it uses less digits than its factorization.

21662312212989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343846225616 (or 343846225613 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 21662312212989 in words is "twenty-one trillion, six hundred sixty-two billion, three hundred twelve million, two hundred twelve thousand, nine hundred eighty-nine".