12121201011021 has 4 divisors (see below), whose sum is σ = 16161601348032. Its totient is φ = 8080800674012.

The previous prime is 12121201011001. The next prime is 12121201011041. The reversal of 12121201011021 is 12011010212121.

It is a happy number.

12121201011021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (12121201011001) and next prime (12121201011041).

It is a cyclic number.

It is not a de Polignac number, because 12121201011021 - 2²⁵ = 12121167456589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121201011001) 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, 2020200168501 + ... + 2020200168506.

It is an arithmetic number, because the mean of its divisors is an integer number (4040400337008).

Almost surely, 2^{12121201011021} is an apocalyptic number.

It is an amenable number.

12121201011021 is a deficient number, since it is larger than the sum of its proper divisors (4040400337011).

12121201011021 is an equidigital number, since it uses as much as digits as its factorization.

12121201011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040400337010.

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

Adding to 12121201011021 its reverse (12011010212121), we get a palindrome (24132211223142).

The spelling of 12121201011021 in words is "twelve trillion, one hundred twenty-one billion, two hundred one million, eleven thousand, twenty-one".