21666224641634 has 8 divisors (see below), whose sum is σ = 32499414382188. Its totient is φ = 10833086514240.

The previous prime is 21666224641601. The next prime is 21666224641639. The reversal of 21666224641634 is 43614642266612.

It can be written as a sum of positive squares in 2 ways, for example, as 21664696066225 + 1528575409 = 4654535^2 + 39097^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21666224641639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11836187 + ... + 13543550.

Almost surely, 2^{21666224641634} is an apocalyptic number.

21666224641634 is a deficient number, since it is larger than the sum of its proper divisors (10833189740554).

21666224641634 is a wasteful number, since it uses less digits than its factorization.

21666224641634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25806580.

The product of its digits is 11943936, while the sum is 53.

The spelling of 21666224641634 in words is "twenty-one trillion, six hundred sixty-six billion, two hundred twenty-four million, six hundred forty-one thousand, six hundred thirty-four".