221111249 has 2 divisors, whose sum is σ = 221111250. Its totient is φ = 221111248.

The previous prime is 221111183. The next prime is 221111257. The reversal of 221111249 is 942111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155176849 + 65934400 = 12457^2 + 8120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221111249 is a prime.

It is not a weakly prime, because it can be changed into another prime (221111269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555624 + 110555625.

It is an arithmetic number, because the mean of its divisors is an integer number (110555625).

Almost surely, 2^221111249 is an apocalyptic number.

It is an amenable number.

221111249 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111249 is an equidigital number, since it uses as much as digits as its factorization.

221111249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 23.

The square root of 221111249 is about 14869.8099853361. The cubic root of 221111249 is about 604.6957913282.

The spelling of 221111249 in words is "two hundred twenty-one million, one hundred eleven thousand, two hundred forty-nine".