21102102199 has 2 divisors, whose sum is σ = 21102102200. Its totient is φ = 21102102198.

The previous prime is 21102102187. The next prime is 21102102223. The reversal of 21102102199 is 99120120112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102102199 - 2⁵ = 21102102167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102102299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551051099 + 10551051100.

It is an arithmetic number, because the mean of its divisors is an integer number (10551051100).

Almost surely, 2^21102102199 is an apocalyptic number.

21102102199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102102199 is an equidigital number, since it uses as much as digits as its factorization.

21102102199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 21102102199 in words is "twenty-one billion, one hundred two million, one hundred two thousand, one hundred ninety-nine".