221234857 has 2 divisors, whose sum is σ = 221234858. Its totient is φ = 221234856.

The previous prime is 221234851. The next prime is 221234863. The reversal of 221234857 is 758432122.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (221234851) and next prime (221234863).

It can be written as a sum of positive squares in only one way, i.e., 213276816 + 7958041 = 14604^2 + 2821^2 .

It is a cyclic number.

It is not a de Polignac number, because 221234857 - 2¹⁹ = 220710569 is a prime.

It is not a weakly prime, because it can be changed into another prime (221234851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110617428 + 110617429.

It is an arithmetic number, because the mean of its divisors is an integer number (110617429).

Almost surely, 2^221234857 is an apocalyptic number.

It is an amenable number.

221234857 is a deficient number, since it is larger than the sum of its proper divisors (1).

221234857 is an equidigital number, since it uses as much as digits as its factorization.

221234857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 34.

The square root of 221234857 is about 14873.9657455569. The cubic root of 221234857 is about 604.8084515294.

Adding to 221234857 its reverse (758432122), we get a palindrome (979666979).

The spelling of 221234857 in words is "two hundred twenty-one million, two hundred thirty-four thousand, eight hundred fifty-seven".