221223502 has 16 divisors (see below), whose sum is σ = 343867392. Its totient is φ = 106628760.

The previous prime is 221223493. The next prime is 221223511. The reversal of 221223502 is 205322122.

221223502 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221223493) and next prime (221223511).

It is a self number, because there is not a number n which added to its sum of digits gives 221223502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9523 + ... + 23089.

It is an arithmetic number, because the mean of its divisors is an integer number (21491712).

Almost surely, 2^221223502 is an apocalyptic number.

221223502 is a deficient number, since it is larger than the sum of its proper divisors (122643890).

221223502 is a wasteful number, since it uses less digits than its factorization.

221223502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13863.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 221223502 is about 14873.5840334467. The cubic root of 221223502 is about 604.7981039776.

Adding to 221223502 its reverse (205322122), we get a palindrome (426545624).

The spelling of 221223502 in words is "two hundred twenty-one million, two hundred twenty-three thousand, five hundred two".