21010212199 has 2 divisors, whose sum is σ = 21010212200. Its totient is φ = 21010212198.

The previous prime is 21010212193. The next prime is 21010212257. The reversal of 21010212199 is 99121201012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010212199 - 2²¹ = 21008115047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010212193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505106099 + 10505106100.

It is an arithmetic number, because the mean of its divisors is an integer number (10505106100).

Almost surely, 2^21010212199 is an apocalyptic number.

21010212199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010212199 is an equidigital number, since it uses as much as digits as its factorization.

21010212199 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 21010212199 in words is "twenty-one billion, ten million, two hundred twelve thousand, one hundred ninety-nine".