121120211021 has 4 divisors (see below), whose sum is σ = 121148065500. Its totient is φ = 121092356544.

The previous prime is 121120210987. The next prime is 121120211039. The reversal of 121120211021 is 120112021121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120112021121 = 15077 ⋅7966573.

It can be written as a sum of positive squares in 2 ways, for example, as 7964670025 + 113155540996 = 89245^2 + 336386^2 .

It is a cyclic number.

It is not a de Polignac number, because 121120211021 - 2³⁰ = 120046469197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121120210987 and 121120211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120211921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13920716 + ... + 13929413.

It is an arithmetic number, because the mean of its divisors is an integer number (30287016375).

Almost surely, 2^121120211021 is an apocalyptic number.

It is an amenable number.

121120211021 is a deficient number, since it is larger than the sum of its proper divisors (27854479).

121120211021 is an equidigital number, since it uses as much as digits as its factorization.

121120211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27854478.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121120211021 its reverse (120112021121), we get a palindrome (241232232142).

The spelling of 121120211021 in words is "one hundred twenty-one billion, one hundred twenty million, two hundred eleven thousand, twenty-one".