121113311221 has 6 divisors (see below), whose sum is σ = 140886913110. Its totient is φ = 103811409576.

The previous prime is 121113311203. The next prime is 121113311239. The reversal of 121113311221 is 122113311121.

It is an interprime number because it is at equal distance from previous prime (121113311203) and next prime (121113311239).

It can be written as a sum of positive squares in only one way, i.e., 121024668996 + 88642225 = 347886^2 + 9415^2 .

It is not a de Polignac number, because 121113311221 - 2⁹ = 121113310709 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 (121113311201) 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 5 ways as a sum of consecutive naturals, for example, 1235850066 + ... + 1235850163.

It is an arithmetic number, because the mean of its divisors is an integer number (23481152185).

Almost surely, 2^121113311221 is an apocalyptic number.

It is an amenable number.

121113311221 is a deficient number, since it is larger than the sum of its proper divisors (19773601889).

121113311221 is an equidigital number, since it uses as much as digits as its factorization.

121113311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471700243 (or 2471700236 counting only the distinct ones).

The product of its digits is 72, while the sum is 19.

Adding to 121113311221 its reverse (122113311121), we get a palindrome (243226622342).

The spelling of 121113311221 in words is "one hundred twenty-one billion, one hundred thirteen million, three hundred eleven thousand, two hundred twenty-one".