221282513 has 2 divisors, whose sum is σ = 221282514. Its totient is φ = 221282512.

The previous prime is 221282447. The next prime is 221282519. The reversal of 221282513 is 315282122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198021184 + 23261329 = 14072^2 + 4823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221282513 is a prime.

It is not a weakly prime, because it can be changed into another prime (221282519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110641256 + 110641257.

It is an arithmetic number, because the mean of its divisors is an integer number (110641257).

Almost surely, 2^221282513 is an apocalyptic number.

It is an amenable number.

221282513 is a deficient number, since it is larger than the sum of its proper divisors (1).

221282513 is an equidigital number, since it uses as much as digits as its factorization.

221282513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 221282513 is about 14875.5676530343. The cubic root of 221282513 is about 604.8518754917.

The spelling of 221282513 in words is "two hundred twenty-one million, two hundred eighty-two thousand, five hundred thirteen".