121310331221 has 16 divisors (see below), whose sum is σ = 130720158720. Its totient is φ = 112248111360.

The previous prime is 121310331193. The next prime is 121310331251. The reversal of 121310331221 is 122133013121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121310331221 - 2¹⁴ = 121310314837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121310331193 and 121310331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121310331251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1827611 + ... + 1892823.

It is an arithmetic number, because the mean of its divisors is an integer number (8170009920).

Almost surely, 2^121310331221 is an apocalyptic number.

It is an amenable number.

121310331221 is a deficient number, since it is larger than the sum of its proper divisors (9409827499).

121310331221 is a wasteful number, since it uses less digits than its factorization.

121310331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67876.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121310331221 its reverse (122133013121), we get a palindrome (243443344342).

The spelling of 121310331221 in words is "one hundred twenty-one billion, three hundred ten million, three hundred thirty-one thousand, two hundred twenty-one".