21919113630 has 24 divisors (see below), whose sum is σ = 56989695672. Its totient is φ = 5845096944.

The previous prime is 21919113563. The next prime is 21919113631. The reversal of 21919113630 is 3631191912.

21919113630 is a `hidden beast` number, since 2 + 1 + 9 + 1 + 9 + 1 + 13 + 630 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919113631) 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, 121772764 + ... + 121772943.

It is an arithmetic number, because the mean of its divisors is an integer number (2374570653).

Almost surely, 2^21919113630 is an apocalyptic number.

21919113630 is an abundant number, since it is smaller than the sum of its proper divisors (35070582042).

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

21919113630 is a wasteful number, since it uses less digits than its factorization.

21919113630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243545720 (or 243545717 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The spelling of 21919113630 in words is "twenty-one billion, nine hundred nineteen million, one hundred thirteen thousand, six hundred thirty".