21103020199 has 2 divisors, whose sum is σ = 21103020200. Its totient is φ = 21103020198.

The previous prime is 21103020097. The next prime is 21103020209. The reversal of 21103020199 is 99102030112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21103020199 - 2²⁷ = 20968802471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103020899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551510099 + 10551510100.

It is an arithmetic number, because the mean of its divisors is an integer number (10551510100).

Almost surely, 2^21103020199 is an apocalyptic number.

21103020199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103020199 is an equidigital number, since it uses as much as digits as its factorization.

21103020199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 21103020199 in words is "twenty-one billion, one hundred three million, twenty thousand, one hundred ninety-nine".