221423151 has 4 divisors (see below), whose sum is σ = 295230872. Its totient is φ = 147615432.

The previous prime is 221423123. The next prime is 221423171. The reversal of 221423151 is 151324122.

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

It is not a de Polignac number, because 221423151 - 2⁷ = 221423023 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 (221423101) 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, 36903856 + ... + 36903861.

It is an arithmetic number, because the mean of its divisors is an integer number (73807718).

Almost surely, 2^221423151 is an apocalyptic number.

221423151 is a deficient number, since it is larger than the sum of its proper divisors (73807721).

221423151 is an equidigital number, since it uses as much as digits as its factorization.

221423151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73807720.

The product of its digits is 480, while the sum is 21.

The square root of 221423151 is about 14880.2940495139. The cubic root of 221423151 is about 604.9799879545.

Adding to 221423151 its reverse (151324122), we get a palindrome (372747273).

The spelling of 221423151 in words is "two hundred twenty-one million, four hundred twenty-three thousand, one hundred fifty-one".