21562736241 has 12 divisors (see below), whose sum is σ = 29775894512. Its totient is φ = 13879460784.

The previous prime is 21562736231. The next prime is 21562736243. The reversal of 21562736241 is 14263726512.

It is not a de Polignac number, because 21562736241 - 2¹⁰ = 21562735217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21562736241.

It is not an unprimeable number, because it can be changed into a prime (21562736243) 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, 4270711 + ... + 4275756.

Almost surely, 2^21562736241 is an apocalyptic number.

It is an amenable number.

21562736241 is a deficient number, since it is larger than the sum of its proper divisors (8213158271).

21562736241 is an equidigital number, since it uses as much as digits as its factorization.

21562736241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8546528 (or 8546499 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The spelling of 21562736241 in words is "twenty-one billion, five hundred sixty-two million, seven hundred thirty-six thousand, two hundred forty-one".