221223507 has 16 divisors (see below), whose sum is σ = 299660928. Its totient is φ = 145143360.

The previous prime is 221223493. The next prime is 221223511. The reversal of 221223507 is 705322122.

It is a happy number.

It is not a de Polignac number, because 221223507 - 2²² = 217029203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221223547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140032 + ... + 141602.

It is an arithmetic number, because the mean of its divisors is an integer number (18728808).

Almost surely, 2^221223507 is an apocalyptic number.

221223507 is a deficient number, since it is larger than the sum of its proper divisors (78437421).

221223507 is a wasteful number, since it uses less digits than its factorization.

221223507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 221223507 is about 14873.5842015299. The cubic root of 221223507 is about 604.7981085341.

Adding to 221223507 its reverse (705322122), we get a palindrome (926545629).

The spelling of 221223507 in words is "two hundred twenty-one million, two hundred twenty-three thousand, five hundred seven".