21202020199 has 2 divisors, whose sum is σ = 21202020200. Its totient is φ = 21202020198.

The previous prime is 21202020197. The next prime is 21202020233. The reversal of 21202020199 is 99102020212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202020199 - 2¹ = 21202020197 is a prime.

Together with 21202020197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202020197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601010099 + 10601010100.

It is an arithmetic number, because the mean of its divisors is an integer number (10601010100).

Almost surely, 2^21202020199 is an apocalyptic number.

21202020199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202020199 is an equidigital number, since it uses as much as digits as its factorization.

21202020199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 21202020199 in words is "twenty-one billion, two hundred two million, twenty thousand, one hundred ninety-nine".