210202012111121 has 4 divisors (see below), whose sum is σ = 210203287147044. Its totient is φ = 210200737075200.

The previous prime is 210202012111109. The next prime is 210202012111139. The reversal of 210202012111121 is 121111210202012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33062948501521 + 177139063609600 = 5750039^2 + 13309360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210202012111121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210202012111121.

It is not an unprimeable number, because it can be changed into a prime (210202012111141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637270640 + ... + 637600401.

It is an arithmetic number, because the mean of its divisors is an integer number (52550821786761).

Almost surely, 2^{210202012111121} is an apocalyptic number.

It is an amenable number.

210202012111121 is a deficient number, since it is larger than the sum of its proper divisors (1275035923).

210202012111121 is a wasteful number, since it uses less digits than its factorization.

210202012111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275035922.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 210202012111121 its reverse (121111210202012), we get a palindrome (331313222313133).

The spelling of 210202012111121 in words is "two hundred ten trillion, two hundred two billion, twelve million, one hundred eleven thousand, one hundred twenty-one".