21992198713 has 16 divisors (see below), whose sum is σ = 22822082560. Its totient is φ = 21175572096.

The previous prime is 21992198707. The next prime is 21992198737. The reversal of 21992198713 is 31789129912.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21992198713 - 2⁹ = 21992198201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21992198783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1916170 + ... + 1927612.

It is an arithmetic number, because the mean of its divisors is an integer number (1426380160).

Almost surely, 2^21992198713 is an apocalyptic number.

It is an amenable number.

21992198713 is a deficient number, since it is larger than the sum of its proper divisors (829883847).

21992198713 is a wasteful number, since it uses less digits than its factorization.

21992198713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12016.

The product of its digits is 489888, while the sum is 52.

The spelling of 21992198713 in words is "twenty-one billion, nine hundred ninety-two million, one hundred ninety-eight thousand, seven hundred thirteen".