111210210000121 has 4 divisors (see below), whose sum is σ = 111310489721700. Its totient is φ = 111109930278544.

The previous prime is 111210210000101. The next prime is 111210210000137. The reversal of 111210210000121 is 121000012012111.

It is a happy number.

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 52792009487721 + 58418200512400 = 7265811^2 + 7643180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111210210000121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111210210000101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50139859126 + ... + 50139861343.

It is an arithmetic number, because the mean of its divisors is an integer number (27827622430425).

Almost surely, 2^{111210210000121} is an apocalyptic number.

It is an amenable number.

111210210000121 is a deficient number, since it is larger than the sum of its proper divisors (100279721579).

111210210000121 is a wasteful number, since it uses less digits than its factorization.

111210210000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100279721578.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111210210000121 its reverse (121000012012111), we get a palindrome (232210222012232).

The spelling of 111210210000121 in words is "one hundred eleven trillion, two hundred ten billion, two hundred ten million, one hundred twenty-one", and thus it is an aban number.