221165151 has 4 divisors (see below), whose sum is σ = 294886872. Its totient is φ = 147443432.

The previous prime is 221165143. The next prime is 221165159. The reversal of 221165151 is 151561122.

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

It is an interprime number because it is at equal distance from previous prime (221165143) and next prime (221165159).

It is a cyclic number.

It is not a de Polignac number, because 221165151 - 2³ = 221165143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221165159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36860856 + ... + 36860861.

It is an arithmetic number, because the mean of its divisors is an integer number (73721718).

Almost surely, 2^221165151 is an apocalyptic number.

221165151 is a deficient number, since it is larger than the sum of its proper divisors (73721721).

221165151 is an equidigital number, since it uses as much as digits as its factorization.

221165151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73721720.

The product of its digits is 600, while the sum is 24.

The square root of 221165151 is about 14871.6223392070. The cubic root of 221165151 is about 604.7449244599.

The spelling of 221165151 in words is "two hundred twenty-one million, one hundred sixty-five thousand, one hundred fifty-one".