21662412744561 has 16 divisors (see below), whose sum is σ = 29106428472000. Its totient is φ = 14330389606848.

The previous prime is 21662412744527. The next prime is 21662412744617. The reversal of 21662412744561 is 16544721426612.

It is not a de Polignac number, because 21662412744561 - 2³⁴ = 21645232875377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21662412744061) 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, 48131986 + ... + 48579963.

It is an arithmetic number, because the mean of its divisors is an integer number (1819151779500).

Almost surely, 2^{21662412744561} is an apocalyptic number.

It is an amenable number.

21662412744561 is a deficient number, since it is larger than the sum of its proper divisors (7444015727439).

21662412744561 is a wasteful number, since it uses less digits than its factorization.

21662412744561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96712528.

The product of its digits is 3870720, while the sum is 51.

The spelling of 21662412744561 in words is "twenty-one trillion, six hundred sixty-two billion, four hundred twelve million, seven hundred forty-four thousand, five hundred sixty-one".