121320221 has 8 divisors (see below), whose sum is σ = 134025600. Its totient is φ = 108894240.

The previous prime is 121320203. The next prime is 121320223. The reversal of 121320221 is 122023121.

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 a de Polignac number, because none of the positive numbers 2^k-121320221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121320196 and 121320205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121320223) 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, 68936 + ... + 70673.

It is an arithmetic number, because the mean of its divisors is an integer number (16753200).

Almost surely, 2^121320221 is an apocalyptic number.

121320221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121320221 is a deficient number, since it is larger than the sum of its proper divisors (12705379).

121320221 is a wasteful number, since it uses less digits than its factorization.

121320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139699.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121320221 is about 11014.5458826045. The cubic root of 121320221 is about 495.0446798428.

Adding to 121320221 its reverse (122023121), we get a palindrome (243343342).

The spelling of 121320221 in words is "one hundred twenty-one million, three hundred twenty thousand, two hundred twenty-one".