121121021112021 has 24 divisors (see below), whose sum is σ = 206395677556224. Its totient is φ = 66979366512480.

The previous prime is 121121021112019. The next prime is 121121021112043. The reversal of 121121021112021 is 120211120121121.

It is a happy number.

121121021112021 is a `hidden beast` number, since 1 + 211 + 210 + 211 + 12 + 0 + 21 = 666.

It is not a de Polignac number, because 121121021112021 - 2¹ = 121121021112019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121121021111985 and 121121021112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121021112521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31008964026 + ... + 31008967931.

It is an arithmetic number, because the mean of its divisors is an integer number (8599819898176).

Almost surely, 2^{121121021112021} is an apocalyptic number.

It is an amenable number.

121121021112021 is a deficient number, since it is larger than the sum of its proper divisors (85274656444203).

121121021112021 is a wasteful number, since it uses less digits than its factorization.

121121021112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62017932001 (or 62017931998 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121121021112021 its reverse (120211120121121), we get a palindrome (241332141233142).

The spelling of 121121021112021 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred twelve thousand, twenty-one".