221564151 has 12 divisors (see below), whose sum is σ = 323029512. Its totient is φ = 146328336.

The previous prime is 221564117. The next prime is 221564159. The reversal of 221564151 is 151465122.

221564151 is a `hidden beast` number, since 2 + 2 + 15 + 641 + 5 + 1 = 666.

It is not a de Polignac number, because 221564151 - 2⁷ = 221564023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221564159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114076 + ... + 116001.

It is an arithmetic number, because the mean of its divisors is an integer number (26919126).

Almost surely, 2^221564151 is an apocalyptic number.

221564151 is a deficient number, since it is larger than the sum of its proper divisors (101465361).

221564151 is a wasteful number, since it uses less digits than its factorization.

221564151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230190 (or 230187 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 221564151 is about 14885.0311051069. The cubic root of 221564151 is about 605.1083757312.

It can be divided in two parts, 2215 and 64151, that added together give a palindrome (66366).

The spelling of 221564151 in words is "two hundred twenty-one million, five hundred sixty-four thousand, one hundred fifty-one".