221500151 has 4 divisors (see below), whose sum is σ = 221643072. Its totient is φ = 221357232.

The previous prime is 221500141. The next prime is 221500159. The reversal of 221500151 is 151005122.

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 221500151 - 2¹⁸ = 221238007 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 (221500159) 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, 69110 + ... + 72243.

It is an arithmetic number, because the mean of its divisors is an integer number (55410768).

Almost surely, 2^221500151 is an apocalyptic number.

221500151 is a deficient number, since it is larger than the sum of its proper divisors (142921).

221500151 is a wasteful number, since it uses less digits than its factorization.

221500151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142920.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 221500151 is about 14882.8811390806. The cubic root of 221500151 is about 605.0501071811.

Adding to 221500151 its reverse (151005122), we get a palindrome (372505273).

The spelling of 221500151 in words is "two hundred twenty-one million, five hundred thousand, one hundred fifty-one".