121413221 has 4 divisors (see below), whose sum is σ = 122548032. Its totient is φ = 120278412.

The previous prime is 121413203. The next prime is 121413233. The reversal of 121413221 is 122314121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121413221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121413221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121413121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567245 + ... + 567458.

It is an arithmetic number, because the mean of its divisors is an integer number (30637008).

Almost surely, 2^121413221 is an apocalyptic number.

It is an amenable number.

121413221 is a deficient number, since it is larger than the sum of its proper divisors (1134811).

121413221 is a wasteful number, since it uses less digits than its factorization.

121413221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134810.

The product of its digits is 96, while the sum is 17.

The square root of 121413221 is about 11018.7667640258. The cubic root of 121413221 is about 495.1711424001.

Adding to 121413221 its reverse (122314121), we get a palindrome (243727342).

The spelling of 121413221 in words is "one hundred twenty-one million, four hundred thirteen thousand, two hundred twenty-one".