210101221201999 has 2 divisors, whose sum is σ = 210101221202000. Its totient is φ = 210101221201998.

The previous prime is 210101221201987. The next prime is 210101221202017. The reversal of 210101221201999 is 999102122101012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210101221201999 - 2⁷ = 210101221201871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210101221204999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050610600999 + 105050610601000.

It is an arithmetic number, because the mean of its divisors is an integer number (105050610601000).

Almost surely, 2^{210101221201999} is an apocalyptic number.

210101221201999 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101221201999 is an equidigital number, since it uses as much as digits as its factorization.

210101221201999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 210101221201999 in words is "two hundred ten trillion, one hundred one billion, two hundred twenty-one million, two hundred one thousand, nine hundred ninety-nine".