221223013 has 4 divisors (see below), whose sum is σ = 241334208. Its totient is φ = 201111820.

The previous prime is 221223001. The next prime is 221223029. The reversal of 221223013 is 310322122.

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 not a de Polignac number, because 221223013 - 2⁹ = 221222501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223043) 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, 10055581 + ... + 10055602.

It is an arithmetic number, because the mean of its divisors is an integer number (60333552).

Almost surely, 2^221223013 is an apocalyptic number.

It is an amenable number.

221223013 is a deficient number, since it is larger than the sum of its proper divisors (20111195).

221223013 is a wasteful number, since it uses less digits than its factorization.

221223013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20111194.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221223013 is about 14873.5675948980. The cubic root of 221223013 is about 604.7976583551.

Adding to 221223013 its reverse (310322122), we get a palindrome (531545135).

The spelling of 221223013 in words is "two hundred twenty-one million, two hundred twenty-three thousand, thirteen".