21103212199 has 2 divisors, whose sum is σ = 21103212200. Its totient is φ = 21103212198.

The previous prime is 21103212197. The next prime is 21103212203. The reversal of 21103212199 is 99121230112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21103212199 - 2¹ = 21103212197 is a prime.

Together with 21103212197, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21103212199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103212197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551606099 + 10551606100.

It is an arithmetic number, because the mean of its divisors is an integer number (10551606100).

Almost surely, 2^21103212199 is an apocalyptic number.

21103212199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103212199 is an equidigital number, since it uses as much as digits as its factorization.

21103212199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 21103212199 in words is "twenty-one billion, one hundred three million, two hundred twelve thousand, one hundred ninety-nine".