201021110121210 has 16 divisors (see below), whose sum is σ = 482450664290976. Its totient is φ = 53605629365648.

The previous prime is 201021110121157. The next prime is 201021110121257. The reversal of 201021110121210 is 12121011120102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201021110121210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3350351835324 + ... + 3350351835383.

It is an arithmetic number, because the mean of its divisors is an integer number (30153166518186).

Almost surely, 2^{201021110121210} is an apocalyptic number.

201021110121210 is an abundant number, since it is smaller than the sum of its proper divisors (281429554169766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201021110121210 is a wasteful number, since it uses less digits than its factorization.

201021110121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700703670717.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201021110121210 its reverse (12121011120102), we get a palindrome (213142121241312).

The spelling of 201021110121210 in words is "two hundred one trillion, twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred ten".