221164564 has 6 divisors (see below), whose sum is σ = 387037994. Its totient is φ = 110582280.

The previous prime is 221164561. The next prime is 221164583. The reversal of 221164564 is 465461122.

It is a happy number.

221164564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 141419664 + 79744900 = 11892^2 + 8930^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221164561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27645567 + ... + 27645574.

Almost surely, 2^221164564 is an apocalyptic number.

It is an amenable number.

221164564 is a deficient number, since it is larger than the sum of its proper divisors (165873430).

221164564 is a wasteful number, since it uses less digits than its factorization.

221164564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55291145 (or 55291143 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 221164564 is about 14871.6026036201. The cubic root of 221164564 is about 604.7443894365.

The spelling of 221164564 in words is "two hundred twenty-one million, one hundred sixty-four thousand, five hundred sixty-four".