121132312221 has 4 divisors (see below), whose sum is σ = 161509749632. Its totient is φ = 80754874812.

The previous prime is 121132312201. The next prime is 121132312289. The reversal of 121132312221 is 122213231121.

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 121132312221 - 2²¹ = 121130215069 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 (121132312201) 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, 20188718701 + ... + 20188718706.

It is an arithmetic number, because the mean of its divisors is an integer number (40377437408).

Almost surely, 2^121132312221 is an apocalyptic number.

It is an amenable number.

121132312221 is a deficient number, since it is larger than the sum of its proper divisors (40377437411).

121132312221 is an equidigital number, since it uses as much as digits as its factorization.

121132312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40377437410.

The product of its digits is 288, while the sum is 21.

Adding to 121132312221 its reverse (122213231121), we get a palindrome (243345543342).

The spelling of 121132312221 in words is "one hundred twenty-one billion, one hundred thirty-two million, three hundred twelve thousand, two hundred twenty-one".