221330151 has 20 divisors (see below), whose sum is σ = 377862672. Its totient is φ = 126474048.

The previous prime is 221330147. The next prime is 221330167. The reversal of 221330151 is 151033122.

It is not a de Polignac number, because 221330151 - 2² = 221330147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221330141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 194610 + ... + 195743.

Almost surely, 2^221330151 is an apocalyptic number.

221330151 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221330151 is a deficient number, since it is larger than the sum of its proper divisors (156532521).

221330151 is an equidigital number, since it uses as much as digits as its factorization.

221330151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390372 (or 390363 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 221330151 is about 14877.1687830716. The cubic root of 221330151 is about 604.8952768218.

Adding to 221330151 its reverse (151033122), we get a palindrome (372363273).

The spelling of 221330151 in words is "two hundred twenty-one million, three hundred thirty thousand, one hundred fifty-one".