210201212121999 has 48 divisors (see below), whose sum is σ = 347403146311008. Its totient is φ = 112329331365888.

The previous prime is 210201212121893. The next prime is 210201212122019. The reversal of 210201212121999 is 999121212102012.

It is not a de Polignac number, because 210201212121999 - 2⁹ = 210201212121487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210201212121999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210201212123999) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 267487054 + ... + 268271739.

It is an arithmetic number, because the mean of its divisors is an integer number (7237565548146).

Almost surely, 2^{210201212121999} is an apocalyptic number.

210201212121999 is a deficient number, since it is larger than the sum of its proper divisors (137201934189009).

210201212121999 is a wasteful number, since it uses less digits than its factorization.

210201212121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535758984 (or 535758977 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 210201212121999 in words is "two hundred ten trillion, two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, nine hundred ninety-nine".