21320011199 has 4 divisors (see below), whose sum is σ = 21320356200. Its totient is φ = 21319666200.

The previous prime is 21320011189. The next prime is 21320011201. The reversal of 21320011199 is 99111002312.

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-21320011199 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 (21320011109) 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, 51524 + ... + 212825.

It is an arithmetic number, because the mean of its divisors is an integer number (5330089050).

Almost surely, 2^21320011199 is an apocalyptic number.

21320011199 is a deficient number, since it is larger than the sum of its proper divisors (345001).

21320011199 is an equidigital number, since it uses as much as digits as its factorization.

21320011199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345000.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 21320011199 in words is "twenty-one billion, three hundred twenty million, eleven thousand, one hundred ninety-nine".