21101313199 has 4 divisors (see below), whose sum is σ = 21142770120. Its totient is φ = 21059856280.

The previous prime is 21101313179. The next prime is 21101313209. The reversal of 21101313199 is 99131310112.

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

It is a cyclic number.

It is not a de Polignac number, because 21101313199 - 2¹⁹ = 21100788911 is a prime.

It is a super-2 number, since 2×21101313199² (a number of 21 digits) contains 22 as substring.

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 21101313199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101313179) 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, 20727697 + ... + 20728714.

It is an arithmetic number, because the mean of its divisors is an integer number (5285692530).

Almost surely, 2^21101313199 is an apocalyptic number.

21101313199 is a deficient number, since it is larger than the sum of its proper divisors (41456921).

21101313199 is an equidigital number, since it uses as much as digits as its factorization.

21101313199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41456920.

The product of its (nonzero) digits is 1458, while the sum is 31.

The spelling of 21101313199 in words is "twenty-one billion, one hundred one million, three hundred thirteen thousand, one hundred ninety-nine".