221122564 has 48 divisors (see below), whose sum is σ = 433379520. Its totient is φ = 98017920.

The previous prime is 221122537. The next prime is 221122567. The reversal of 221122564 is 465221122.

It is not an unprimeable number, because it can be changed into a prime (221122567) 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, 498927 + ... + 499369.

It is an arithmetic number, because the mean of its divisors is an integer number (9028740).

Almost surely, 2^221122564 is an apocalyptic number.

It is an amenable number.

221122564 is a deficient number, since it is larger than the sum of its proper divisors (212256956).

221122564 is a wasteful number, since it uses less digits than its factorization.

221122564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 818 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 221122564 is about 14870.1904493520. The cubic root of 221122564 is about 604.7061059191.

Adding to 221122564 its reverse (465221122), we get a palindrome (686343686).

The spelling of 221122564 in words is "two hundred twenty-one million, one hundred twenty-two thousand, five hundred sixty-four".