21953645226 has 12 divisors (see below), whose sum is σ = 47566231362. Its totient is φ = 7317881736.

The previous prime is 21953645191. The next prime is 21953645237. The reversal of 21953645226 is 62254635912.

21953645226 is a `hidden beast` number, since 2 + 1 + 95 + 36 + 4 + 522 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21814994601 + 138650625 = 147699^2 + 11775^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 609823461 + ... + 609823496.

Almost surely, 2^21953645226 is an apocalyptic number.

21953645226 is an abundant number, since it is smaller than the sum of its proper divisors (25612586136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21953645226 is a wasteful number, since it uses less digits than its factorization.

21953645226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219646965 (or 1219646962 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 21953645226 in words is "twenty-one billion, nine hundred fifty-three million, six hundred forty-five thousand, two hundred twenty-six".