221413313 has 4 divisors (see below), whose sum is σ = 241541808. Its totient is φ = 201284820.

The previous prime is 221413273. The next prime is 221413319. The reversal of 221413313 is 313314122.

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 de Polignac number, because none of the positive numbers 2^k-221413313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221413319) 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, 10064231 + ... + 10064252.

It is an arithmetic number, because the mean of its divisors is an integer number (60385452).

Almost surely, 2^221413313 is an apocalyptic number.

It is an amenable number.

221413313 is a deficient number, since it is larger than the sum of its proper divisors (20128495).

221413313 is a wasteful number, since it uses less digits than its factorization.

221413313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20128494.

The product of its digits is 432, while the sum is 20.

The square root of 221413313 is about 14879.9634744175. The cubic root of 221413313 is about 604.9710279139.

Adding to 221413313 its reverse (313314122), we get a palindrome (534727435).

The spelling of 221413313 in words is "two hundred twenty-one million, four hundred thirteen thousand, three hundred thirteen".