221102461 has 2 divisors, whose sum is σ = 221102462. Its totient is φ = 221102460.

The previous prime is 221102419. The next prime is 221102471. The reversal of 221102461 is 164201122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202179961 + 18922500 = 14219^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 221102461 - 2²¹ = 219005309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221102471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551230 + 110551231.

It is an arithmetic number, because the mean of its divisors is an integer number (110551231).

Almost surely, 2^221102461 is an apocalyptic number.

It is an amenable number.

221102461 is a deficient number, since it is larger than the sum of its proper divisors (1).

221102461 is an equidigital number, since it uses as much as digits as its factorization.

221102461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 221102461 is about 14869.5144843401. The cubic root of 221102461 is about 604.6877800714.

Adding to 221102461 its reverse (164201122), we get a palindrome (385303583).

The spelling of 221102461 in words is "two hundred twenty-one million, one hundred two thousand, four hundred sixty-one".