202111121121 has 64 divisors (see below), whose sum is σ = 343760524800. Its totient is φ = 102774583296.

The previous prime is 202111121117. The next prime is 202111121123. The reversal of 202111121121 is 121121111202.

It is a happy number.

It is not a de Polignac number, because 202111121121 - 2² = 202111121117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202111121121.

It is not an unprimeable number, because it can be changed into a prime (202111121123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1009225 + ... + 1192793.

It is an arithmetic number, because the mean of its divisors is an integer number (5371258200).

Almost surely, 2^202111121121 is an apocalyptic number.

202111121121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202111121121 is a deficient number, since it is larger than the sum of its proper divisors (141649403679).

202111121121 is a wasteful number, since it uses less digits than its factorization.

202111121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183738.

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

Adding to 202111121121 its reverse (121121111202), we get a palindrome (323232232323).

The spelling of 202111121121 in words is "two hundred two billion, one hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".