121120121021 has 4 divisors (see below), whose sum is σ = 121161139932. Its totient is φ = 121079102112.

The previous prime is 121120120999. The next prime is 121120121063. The reversal of 121120121021 is 120121021121.

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 42349524100 + 78770596921 = 205790^2 + 280661^2 .

It is a cyclic number.

It is not a de Polignac number, because 121120121021 - 2³⁰ = 120046379197 is a prime.

It is a super-2 number, since 2×121120121021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121120120987 and 121120121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120127021) 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, 20505026 + ... + 20510931.

It is an arithmetic number, because the mean of its divisors is an integer number (30290284983).

Almost surely, 2^121120121021 is an apocalyptic number.

It is an amenable number.

121120121021 is a deficient number, since it is larger than the sum of its proper divisors (41018911).

121120121021 is an equidigital number, since it uses as much as digits as its factorization.

121120121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41018910.

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

Adding to 121120121021 its reverse (120121021121), we get a palindrome (241241142142).

It can be divided in two parts, 121 and 120121021, that multiplied together give a palindrome (14534643541).

The spelling of 121120121021 in words is "one hundred twenty-one billion, one hundred twenty million, one hundred twenty-one thousand, twenty-one".