121221330213 has 4 divisors (see below), whose sum is σ = 161628440288. Its totient is φ = 80814220140.

The previous prime is 121221330173. The next prime is 121221330319. The reversal of 121221330213 is 312033122121.

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 121221330213 - 2⁶ = 121221330149 is a prime.

It is a super-2 number, since 2×121221330213² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121221330213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221338213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20203555033 + ... + 20203555038.

It is an arithmetic number, because the mean of its divisors is an integer number (40407110072).

Almost surely, 2^121221330213 is an apocalyptic number.

It is an amenable number.

121221330213 is a deficient number, since it is larger than the sum of its proper divisors (40407110075).

121221330213 is an equidigital number, since it uses as much as digits as its factorization.

121221330213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40407110074.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 121221330213 its reverse (312033122121), we get a palindrome (433254452334).

The spelling of 121221330213 in words is "one hundred twenty-one billion, two hundred twenty-one million, three hundred thirty thousand, two hundred thirteen".