121021011021 has 4 divisors (see below), whose sum is σ = 161361348032. Its totient is φ = 80680674012.

The previous prime is 121021010993. The next prime is 121021011127. The reversal of 121021011021 is 120110120121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121021011021 - 2¹⁴ = 121020994637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121021010988 and 121021011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021011821) 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, 20170168501 + ... + 20170168506.

It is an arithmetic number, because the mean of its divisors is an integer number (40340337008).

Almost surely, 2^121021011021 is an apocalyptic number.

It is an amenable number.

121021011021 is a deficient number, since it is larger than the sum of its proper divisors (40340337011).

121021011021 is an equidigital number, since it uses as much as digits as its factorization.

121021011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340337010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121021011021 its reverse (120110120121), we get a palindrome (241131131142).

The spelling of 121021011021 in words is "one hundred twenty-one billion, twenty-one million, eleven thousand, twenty-one".