21413265642 has 24 divisors (see below), whose sum is σ = 46567893060. Its totient is φ = 7111219200.

The previous prime is 21413265641. The next prime is 21413265647. The reversal of 21413265642 is 24656231412.

21413265642 is a `hidden beast` number, since 2 + 1 + 4 + 1 + 3 + 2 + 6 + 5 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17370976401 + 4042289241 = 131799^2 + 63579^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21413265597 and 21413265606.

It is not an unprimeable number, because it can be changed into a prime (21413265641) 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, 2206359 + ... + 2216042.

Almost surely, 2^21413265642 is an apocalyptic number.

21413265642 is an abundant number, since it is smaller than the sum of its proper divisors (25154627418).

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

21413265642 is a wasteful number, since it uses less digits than its factorization.

21413265642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422678 (or 4422675 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 21413265642 in words is "twenty-one billion, four hundred thirteen million, two hundred sixty-five thousand, six hundred forty-two".