121021313221 has 6 divisors (see below), whose sum is σ = 126511883750. Its totient is φ = 115759516488.

The previous prime is 121021313197. The next prime is 121021313263. The reversal of 121021313221 is 122313120121.

It can be written as a sum of positive squares in only one way, i.e., 114233860225 + 6787452996 = 337985^2 + 82386^2 .

It is not a de Polignac number, because 121021313221 - 2²⁵ = 120987758789 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 (121021313291) 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 5 ways as a sum of consecutive naturals, for example, 114386346 + ... + 114387403.

Almost surely, 2^121021313221 is an apocalyptic number.

It is an amenable number.

121021313221 is a deficient number, since it is larger than the sum of its proper divisors (5490570529).

121021313221 is an equidigital number, since it uses as much as digits as its factorization.

121021313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228773795 (or 228773772 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121021313221 its reverse (122313120121), we get a palindrome (243334433342).

The spelling of 121021313221 in words is "one hundred twenty-one billion, twenty-one million, three hundred thirteen thousand, two hundred twenty-one".