121123031331221 has 4 divisors (see below), whose sum is σ = 122782250938572. Its totient is φ = 119463811723872.

The previous prime is 121123031331217. The next prime is 121123031331223. The reversal of 121123031331221 is 122133130321121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40402689528721 + 80720341802500 = 6356311^2 + 8984450^2 .

It is a cyclic number.

It is not a de Polignac number, because 121123031331221 - 2² = 121123031331217 is a prime.

It is a super-2 number, since 2×121123031331221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123031331223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829609803566 + ... + 829609803711.

It is an arithmetic number, because the mean of its divisors is an integer number (30695562734643).

Almost surely, 2^{121123031331221} is an apocalyptic number.

It is an amenable number.

121123031331221 is a deficient number, since it is larger than the sum of its proper divisors (1659219607351).

121123031331221 is an equidigital number, since it uses as much as digits as its factorization.

121123031331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659219607350.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 121123031331221 its reverse (122133130321121), we get a palindrome (243256161652342).

The spelling of 121123031331221 in words is "one hundred twenty-one trillion, one hundred twenty-three billion, thirty-one million, three hundred thirty-one thousand, two hundred twenty-one".