121231233221 has 16 divisors (see below), whose sum is σ = 146724537600. Its totient is φ = 97783614720.

The previous prime is 121231233217. The next prime is 121231233259. The reversal of 121231233221 is 122332132121.

It is a cyclic number.

It is not a de Polignac number, because 121231233221 - 2² = 121231233217 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 (121231233271) 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 15 ways as a sum of consecutive naturals, for example, 655511 + ... + 819851.

It is an arithmetic number, because the mean of its divisors is an integer number (9170283600).

Almost surely, 2^121231233221 is an apocalyptic number.

It is an amenable number.

121231233221 is a deficient number, since it is larger than the sum of its proper divisors (25493304379).

121231233221 is a wasteful number, since it uses less digits than its factorization.

121231233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170564.

The product of its digits is 864, while the sum is 23.

Adding to 121231233221 its reverse (122332132121), we get a palindrome (243563365342).

The spelling of 121231233221 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred thirty-three thousand, two hundred twenty-one".