221242151 has 8 divisors (see below), whose sum is σ = 239392944. Its totient is φ = 203253120.

The previous prime is 221242139. The next prime is 221242157. The reversal of 221242151 is 151242122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221242151 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 (221242157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37586 + ... + 43071.

It is an arithmetic number, because the mean of its divisors is an integer number (29924118).

Almost surely, 2^221242151 is an apocalyptic number.

221242151 is a deficient number, since it is larger than the sum of its proper divisors (18150793).

221242151 is a wasteful number, since it uses less digits than its factorization.

221242151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80881.

The product of its digits is 320, while the sum is 20.

The square root of 221242151 is about 14874.2109370548. The cubic root of 221242151 is about 604.8150981981.

Adding to 221242151 its reverse (151242122), we get a palindrome (372484273).

The spelling of 221242151 in words is "two hundred twenty-one million, two hundred forty-two thousand, one hundred fifty-one".