121221321 has 8 divisors (see below), whose sum is σ = 174061440. Its totient is φ = 74597712.

The previous prime is 121221283. The next prime is 121221337. The reversal of 121221321 is 123122121.

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

It is not a de Polignac number, because 121221321 - 2⁹ = 121220809 is a prime.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 121221321.

It is not an unprimeable number, because it can be changed into a prime (121221371) 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, 1554081 + ... + 1554158.

It is an arithmetic number, because the mean of its divisors is an integer number (21757680).

Almost surely, 2^121221321 is an apocalyptic number.

It is an amenable number.

121221321 is a deficient number, since it is larger than the sum of its proper divisors (52840119).

121221321 is a wasteful number, since it uses less digits than its factorization.

121221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108255.

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

The square root of 121221321 is about 11010.0554494517. The cubic root of 121221321 is about 494.9101234639.

Adding to 121221321 its reverse (123122121), we get a palindrome (244343442).

The spelling of 121221321 in words is "one hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty-one".