121021201221 has 4 divisors (see below), whose sum is σ = 161361601632. Its totient is φ = 80680800812.

The previous prime is 121021201207. The next prime is 121021201229. The reversal of 121021201221 is 122102120121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122102120121 = 3 ⋅40700706707.

It is a cyclic number.

It is not a de Polignac number, because 121021201221 - 2²² = 121017006917 is a prime.

It is a super-2 number, since 2×121021201221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121021201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021201229) 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, 20170200201 + ... + 20170200206.

It is an arithmetic number, because the mean of its divisors is an integer number (40340400408).

Almost surely, 2^121021201221 is an apocalyptic number.

It is an amenable number.

121021201221 is a deficient number, since it is larger than the sum of its proper divisors (40340400411).

121021201221 is an equidigital number, since it uses as much as digits as its factorization.

121021201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340400410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121021201221 its reverse (122102120121), we get a palindrome (243123321342).

The spelling of 121021201221 in words is "one hundred twenty-one billion, twenty-one million, two hundred one thousand, two hundred twenty-one".