221143513 has 2 divisors, whose sum is σ = 221143514. Its totient is φ = 221143512.

The previous prime is 221143471. The next prime is 221143523. The reversal of 221143513 is 315341122.

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., 156550144 + 64593369 = 12512^2 + 8037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221143513 is a prime.

It is not a weakly prime, because it can be changed into another prime (221143523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571756 + 110571757.

It is an arithmetic number, because the mean of its divisors is an integer number (110571757).

Almost surely, 2^221143513 is an apocalyptic number.

It is an amenable number.

221143513 is a deficient number, since it is larger than the sum of its proper divisors (1).

221143513 is an equidigital number, since it uses as much as digits as its factorization.

221143513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 221143513 is about 14870.8948284896. The cubic root of 221143513 is about 604.7252017965.

Adding to 221143513 its reverse (315341122), we get a palindrome (536484635).

The spelling of 221143513 in words is "two hundred twenty-one million, one hundred forty-three thousand, five hundred thirteen".