221498281 has 2 divisors, whose sum is σ = 221498282. Its totient is φ = 221498280.

The previous prime is 221498267. The next prime is 221498293. The reversal of 221498281 is 182894122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196448256 + 25050025 = 14016^2 + 5005^2 .

It is a cyclic number.

It is not a de Polignac number, because 221498281 - 2²¹ = 219401129 is a prime.

It is a super-2 number, since 2×221498281² = 98122976971909922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221498281.

It is not a weakly prime, because it can be changed into another prime (221498231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110749140 + 110749141.

It is an arithmetic number, because the mean of its divisors is an integer number (110749141).

Almost surely, 2^221498281 is an apocalyptic number.

It is an amenable number.

221498281 is a deficient number, since it is larger than the sum of its proper divisors (1).

221498281 is an equidigital number, since it uses as much as digits as its factorization.

221498281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 37.

The square root of 221498281 is about 14882.8183150907. The cubic root of 221498281 is about 605.0484044782.

The spelling of 221498281 in words is "two hundred twenty-one million, four hundred ninety-eight thousand, two hundred eighty-one".