21662312213043 has 12 divisors (see below), whose sum is σ = 31599808576128. Its totient is φ = 14298555915600.

The previous prime is 21662312213023. The next prime is 21662312213083. The reversal of 21662312213043 is 34031221326612.

21662312213043 is a `hidden beast` number, since 2 + 1 + 6 + 623 + 1 + 2 + 21 + 3 + 0 + 4 + 3 = 666.

It is not a de Polignac number, because 21662312213043 - 2²⁸ = 21662043777587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21662312212989 and 21662312213007.

It is not an unprimeable number, because it can be changed into a prime (21662312213023) 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, 11915462355 + ... + 11915464172.

It is an arithmetic number, because the mean of its divisors is an integer number (2633317381344).

Almost surely, 2^{21662312213043} is an apocalyptic number.

21662312213043 is a deficient number, since it is larger than the sum of its proper divisors (9937496363085).

21662312213043 is a wasteful number, since it uses less digits than its factorization.

21662312213043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23830926634 (or 23830926631 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

Adding to 21662312213043 its reverse (34031221326612), we get a palindrome (55693533539655).

The spelling of 21662312213043 in words is "twenty-one trillion, six hundred sixty-two billion, three hundred twelve million, two hundred thirteen thousand, forty-three".