21452679361 has 4 divisors (see below), whose sum is σ = 21464208724. Its totient is φ = 21441150000.

The previous prime is 21452679331. The next prime is 21452679379. The reversal of 21452679361 is 16397625412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3266808336 + 18185871025 = 57156^2 + 134855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21452679361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21452679331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5761890 + ... + 5765611.

It is an arithmetic number, because the mean of its divisors is an integer number (5366052181).

Almost surely, 2^21452679361 is an apocalyptic number.

It is an amenable number.

21452679361 is a deficient number, since it is larger than the sum of its proper divisors (11529363).

21452679361 is a wasteful number, since it uses less digits than its factorization.

21452679361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11529362.

The product of its digits is 544320, while the sum is 46.

The spelling of 21452679361 in words is "twenty-one billion, four hundred fifty-two million, six hundred seventy-nine thousand, three hundred sixty-one".