121111200021021 has 16 divisors (see below), whose sum is σ = 185581407859200. Its totient is φ = 68819772076848.

The previous prime is 121111200020999. The next prime is 121111200021113. The reversal of 121111200021021 is 120120002111121.

It is a happy number.

It is not a de Polignac number, because 121111200021021 - 2⁷ = 121111200020893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111200021421) 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 15 ways as a sum of consecutive naturals, for example, 16109493451 + ... + 16109500968.

It is an arithmetic number, because the mean of its divisors is an integer number (11598837991200).

Almost surely, 2^{121111200021021} is an apocalyptic number.

It is an amenable number.

121111200021021 is a deficient number, since it is larger than the sum of its proper divisors (64470207838179).

121111200021021 is a wasteful number, since it uses less digits than its factorization.

121111200021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32218994608.

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

Adding to 121111200021021 its reverse (120120002111121), we get a palindrome (241231202132142).

The spelling of 121111200021021 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred million, twenty-one thousand, twenty-one".