21321402199 has 2 divisors, whose sum is σ = 21321402200. Its totient is φ = 21321402198.

The previous prime is 21321402173. The next prime is 21321402211. The reversal of 21321402199 is 99120412312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321402199 - 2⁷ = 21321402071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321402299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660701099 + 10660701100.

It is an arithmetic number, because the mean of its divisors is an integer number (10660701100).

Almost surely, 2^21321402199 is an apocalyptic number.

21321402199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321402199 is an equidigital number, since it uses as much as digits as its factorization.

21321402199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 21321402199 in words is "twenty-one billion, three hundred twenty-one million, four hundred two thousand, one hundred ninety-nine".