224221157 has 2 divisors, whose sum is σ = 224221158. Its totient is φ = 224221156.

The previous prime is 224221139. The next prime is 224221189. The reversal of 224221157 is 751122422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210076036 + 14145121 = 14494^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 224221157 - 2⁶ = 224221093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224226157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112110578 + 112110579.

It is an arithmetic number, because the mean of its divisors is an integer number (112110579).

Almost surely, 2^224221157 is an apocalyptic number.

It is an amenable number.

224221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

224221157 is an equidigital number, since it uses as much as digits as its factorization.

224221157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 26.

The square root of 224221157 is about 14974.0160611641. The cubic root of 224221157 is about 607.5175985463.

Adding to 224221157 its reverse (751122422), we get a palindrome (975343579).

The spelling of 224221157 in words is "two hundred twenty-four million, two hundred twenty-one thousand, one hundred fifty-seven".