221446513 has 2 divisors, whose sum is σ = 221446514. Its totient is φ = 221446512.

The previous prime is 221446481. The next prime is 221446541. The reversal of 221446513 is 315644122.

It is an a-pointer prime, because the next prime (221446541) can be obtained adding 221446513 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148035889 + 73410624 = 12167^2 + 8568^2 .

It is a cyclic number.

It is not a de Polignac number, because 221446513 - 2⁵ = 221446481 is a prime.

It is not a weakly prime, because it can be changed into another prime (221446543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110723256 + 110723257.

It is an arithmetic number, because the mean of its divisors is an integer number (110723257).

Almost surely, 2^221446513 is an apocalyptic number.

It is an amenable number.

221446513 is a deficient number, since it is larger than the sum of its proper divisors (1).

221446513 is an equidigital number, since it uses as much as digits as its factorization.

221446513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 221446513 is about 14881.0790267373. The cubic root of 221446513 is about 605.0012640276.

The spelling of 221446513 in words is "two hundred twenty-one million, four hundred forty-six thousand, five hundred thirteen".