21654226773 has 10 divisors (see below), whose sum is σ = 32347672214. Its totient is φ = 14436151128.

The previous prime is 21654226751. The next prime is 21654226813. The reversal of 21654226773 is 37762245612.

21654226773 is a `hidden beast` number, since 2 + 16 + 542 + 26 + 7 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20062456164 + 1591770609 = 141642^2 + 39897^2 .

It is not a de Polignac number, because 21654226773 - 2⁶ = 21654226709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21654226723) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 133667986 + ... + 133668147.

Almost surely, 2^21654226773 is an apocalyptic number.

It is an amenable number.

21654226773 is a deficient number, since it is larger than the sum of its proper divisors (10693445441).

21654226773 is an equidigital number, since it uses as much as digits as its factorization.

21654226773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267336145 (or 267336136 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The spelling of 21654226773 in words is "twenty-one billion, six hundred fifty-four million, two hundred twenty-six thousand, seven hundred seventy-three".