202111202011121 has 4 divisors (see below), whose sum is σ = 217658217550452. Its totient is φ = 186564186471792.

The previous prime is 202111202011097. The next prime is 202111202011139. The reversal of 202111202011121 is 121110202111202.

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 74054819571121 + 128056382440000 = 8605511^2 + 11316200^2 .

It is a cyclic number.

It is not a de Polignac number, because 202111202011121 - 2³⁴ = 202094022141937 is a prime.

It is a super-2 number, since 2×202111202011121² (a number of 29 digits) contains 22 as substring.

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 202111202011121.

It is not an unprimeable number, because it can be changed into a prime (202111202011321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7773507769646 + ... + 7773507769671.

It is an arithmetic number, because the mean of its divisors is an integer number (54414554387613).

Almost surely, 2^{202111202011121} is an apocalyptic number.

It is an amenable number.

202111202011121 is a deficient number, since it is larger than the sum of its proper divisors (15547015539331).

202111202011121 is a wasteful number, since it uses less digits than its factorization.

202111202011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15547015539330.

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

Adding to 202111202011121 its reverse (121110202111202), we get a palindrome (323221404122323).

The spelling of 202111202011121 in words is "two hundred two trillion, one hundred eleven billion, two hundred two million, eleven thousand, one hundred twenty-one".