121232221 has 8 divisors (see below), whose sum is σ = 132349824. Its totient is φ = 110130720.

The previous prime is 121232213. The next prime is 121232231. The reversal of 121232221 is 122232121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121232221 - 2³ = 121232213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121232195 and 121232204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121232231) 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, 16140 + ... + 22426.

It is an arithmetic number, because the mean of its divisors is an integer number (16543728).

Almost surely, 2^121232221 is an apocalyptic number.

121232221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121232221 is a deficient number, since it is larger than the sum of its proper divisors (11117603).

121232221 is a wasteful number, since it uses less digits than its factorization.

121232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8051.

The product of its digits is 96, while the sum is 16.

The square root of 121232221 is about 11010.5504403731. The cubic root of 121232221 is about 494.9249568244.

Adding to 121232221 its reverse (122232121), we get a palindrome (243464342).

It can be divided in two parts, 1212 and 32221, that added together give a palindrome (33433).

The spelling of 121232221 in words is "one hundred twenty-one million, two hundred thirty-two thousand, two hundred twenty-one".