21130312199 has 4 divisors (see below), whose sum is σ = 21176549664. Its totient is φ = 21084074736.

The previous prime is 21130312157. The next prime is 21130312211. The reversal of 21130312199 is 99121303112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130312199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130312999) 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, 23118047 + ... + 23118960.

It is an arithmetic number, because the mean of its divisors is an integer number (5294137416).

Almost surely, 2^21130312199 is an apocalyptic number.

21130312199 is a deficient number, since it is larger than the sum of its proper divisors (46237465).

21130312199 is an equidigital number, since it uses as much as digits as its factorization.

21130312199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46237464.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 21130312199 in words is "twenty-one billion, one hundred thirty million, three hundred twelve thousand, one hundred ninety-nine".