221221411 has 4 divisors (see below), whose sum is σ = 223411824. Its totient is φ = 219031000.

The previous prime is 221221397. The next prime is 221221421. The reversal of 221221411 is 114122122.

221221411 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221221411 - 2⁵ = 221221379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221421) 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, 1095055 + ... + 1095256.

It is an arithmetic number, because the mean of its divisors is an integer number (55852956).

Almost surely, 2^221221411 is an apocalyptic number.

221221411 is a deficient number, since it is larger than the sum of its proper divisors (2190413).

221221411 is a wasteful number, since it uses less digits than its factorization.

221221411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190412.

The product of its digits is 64, while the sum is 16.

The square root of 221221411 is about 14873.5137408751. The cubic root of 221221411 is about 604.7961984585.

Adding to 221221411 its reverse (114122122), we get a palindrome (335343533).

The spelling of 221221411 in words is "two hundred twenty-one million, two hundred twenty-one thousand, four hundred eleven".