221030137 has 2 divisors, whose sum is σ = 221030138. Its totient is φ = 221030136.

The previous prime is 221030129. The next prime is 221030177. The reversal of 221030137 is 731030122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219750976 + 1279161 = 14824^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 221030137 - 2³ = 221030129 is a prime.

It is not a weakly prime, because it can be changed into another prime (221030177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110515068 + 110515069.

It is an arithmetic number, because the mean of its divisors is an integer number (110515069).

Almost surely, 2^221030137 is an apocalyptic number.

It is an amenable number.

221030137 is a deficient number, since it is larger than the sum of its proper divisors (1).

221030137 is an equidigital number, since it uses as much as digits as its factorization.

221030137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 221030137 is about 14867.0823297646. The cubic root of 221030137 is about 604.6218404942.

Adding to 221030137 its reverse (731030122), we get a palindrome (952060259).

The spelling of 221030137 in words is "two hundred twenty-one million, thirty thousand, one hundred thirty-seven".