21213442199 has 2 divisors, whose sum is σ = 21213442200. Its totient is φ = 21213442198.

The previous prime is 21213442157. The next prime is 21213442213. The reversal of 21213442199 is 99124431212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213442199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213442139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606721099 + 10606721100.

It is an arithmetic number, because the mean of its divisors is an integer number (10606721100).

Almost surely, 2^21213442199 is an apocalyptic number.

21213442199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213442199 is an equidigital number, since it uses as much as digits as its factorization.

21213442199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The spelling of 21213442199 in words is "twenty-one billion, two hundred thirteen million, four hundred forty-two thousand, one hundred ninety-nine".