210101009999 has 2 divisors, whose sum is σ = 210101010000. Its totient is φ = 210101009998.

The previous prime is 210101009959. The next prime is 210101010011. The reversal of 210101009999 is 999900101012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210101009999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210101009959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050504999 + 105050505000.

It is an arithmetic number, because the mean of its divisors is an integer number (105050505000).

Almost surely, 2^210101009999 is an apocalyptic number.

210101009999 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101009999 is an equidigital number, since it uses as much as digits as its factorization.

210101009999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 210101009999 in words is "two hundred ten billion, one hundred one million, nine thousand, nine hundred ninety-nine".