221065151 has 4 divisors (see below), whose sum is σ = 221429952. Its totient is φ = 220700352.

The previous prime is 221065139. The next prime is 221065157. The reversal of 221065151 is 151560122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221065151 - 2²² = 216870847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221065157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181490 + ... + 182703.

It is an arithmetic number, because the mean of its divisors is an integer number (55357488).

Almost surely, 2^221065151 is an apocalyptic number.

221065151 is a deficient number, since it is larger than the sum of its proper divisors (364801).

221065151 is an equidigital number, since it uses as much as digits as its factorization.

221065151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364800.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 221065151 is about 14868.2598511056. The cubic root of 221065151 is about 604.6537654188.

The spelling of 221065151 in words is "two hundred twenty-one million, sixty-five thousand, one hundred fifty-one".