21174614641 has 4 divisors (see below), whose sum is σ = 21196512832. Its totient is φ = 21152716452.

The previous prime is 21174614633. The next prime is 21174614651. The reversal of 21174614641 is 14641647112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21174614641 - 2³ = 21174614633 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 21174614641.

It is not an unprimeable number, because it can be changed into a prime (21174614611) 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, 10947645 + ... + 10949578.

It is an arithmetic number, because the mean of its divisors is an integer number (5299128208).

Almost surely, 2^21174614641 is an apocalyptic number.

It is an amenable number.

21174614641 is a deficient number, since it is larger than the sum of its proper divisors (21898191).

21174614641 is an equidigital number, since it uses as much as digits as its factorization.

21174614641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21898190.

The product of its digits is 32256, while the sum is 37.

The spelling of 21174614641 in words is "twenty-one billion, one hundred seventy-four million, six hundred fourteen thousand, six hundred forty-one".