121231221 has 8 divisors (see below), whose sum is σ = 162162624. Its totient is φ = 80560320.

The previous prime is 121231181. The next prime is 121231237. The reversal of 121231221 is 122132121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121231221 - 2⁶ = 121231157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64036 + ... + 65901.

It is an arithmetic number, because the mean of its divisors is an integer number (20270328).

Almost surely, 2^121231221 is an apocalyptic number.

It is an amenable number.

121231221 is a deficient number, since it is larger than the sum of its proper divisors (40931403).

121231221 is a wasteful number, since it uses less digits than its factorization.

121231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130251.

The product of its digits is 48, while the sum is 15.

The square root of 121231221 is about 11010.5050292891. The cubic root of 121231221 is about 494.9235960027.

Adding to 121231221 its reverse (122132121), we get a palindrome (243363342).

The spelling of 121231221 in words is "one hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-one".