21226561465653 has 12 divisors (see below), whose sum is σ = 30661265059308. Its totient is φ = 14150728849920.

The previous prime is 21226561465601. The next prime is 21226561465721. The reversal of 21226561465653 is 35656416562212.

21226561465653 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 65 + 6 + 14 + 6 + 565 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15202840442724 + 6023721022929 = 3899082^2 + 2454327^2 .

It is not a de Polignac number, because 21226561465653 - 2¹⁶ = 21226561400117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21226561465653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226561465253) 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, 25579518 + ... + 26396303.

It is an arithmetic number, because the mean of its divisors is an integer number (2555105421609).

Almost surely, 2^{21226561465653} is an apocalyptic number.

It is an amenable number.

21226561465653 is a deficient number, since it is larger than the sum of its proper divisors (9434703593655).

21226561465653 is a wasteful number, since it uses less digits than its factorization.

21226561465653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52021204 (or 52021201 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 54.

The spelling of 21226561465653 in words is "twenty-one trillion, two hundred twenty-six billion, five hundred sixty-one million, four hundred sixty-five thousand, six hundred fifty-three".