210213099991 has 2 divisors, whose sum is σ = 210213099992. Its totient is φ = 210213099990.

The previous prime is 210213099953. The next prime is 210213100037. The reversal of 210213099991 is 199990312012.

It is an a-pointer prime, because the next prime (210213100037) can be obtained adding 210213099991 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210213099991 - 2¹⁵ = 210213067223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210213094991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105106549995 + 105106549996.

It is an arithmetic number, because the mean of its divisors is an integer number (105106549996).

Almost surely, 2^210213099991 is an apocalyptic number.

210213099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

210213099991 is an equidigital number, since it uses as much as digits as its factorization.

210213099991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 46.

The spelling of 210213099991 in words is "two hundred ten billion, two hundred thirteen million, ninety-nine thousand, nine hundred ninety-one".