121131421020221 has 4 divisors (see below), whose sum is σ = 122590835731392. Its totient is φ = 119672006309052.

The previous prime is 121131421020167. The next prime is 121131421020229. The reversal of 121131421020221 is 122020124131121.

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 a cyclic number.

It is not a de Polignac number, because 121131421020221 - 2⁶ = 121131421020157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131421020229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729707355461 + ... + 729707355626.

It is an arithmetic number, because the mean of its divisors is an integer number (30647708932848).

Almost surely, 2^{121131421020221} is an apocalyptic number.

It is an amenable number.

121131421020221 is a deficient number, since it is larger than the sum of its proper divisors (1459414711171).

121131421020221 is an equidigital number, since it uses as much as digits as its factorization.

121131421020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459414711170.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 121131421020221 its reverse (122020124131121), we get a palindrome (243151545151342).

The spelling of 121131421020221 in words is "one hundred twenty-one trillion, one hundred thirty-one billion, four hundred twenty-one million, twenty thousand, two hundred twenty-one".