221236349 has 2 divisors, whose sum is σ = 221236350. Its totient is φ = 221236348.

The previous prime is 221236297. The next prime is 221236373. The reversal of 221236349 is 943632122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169468324 + 51768025 = 13018^2 + 7195^2 .

It is a cyclic number.

It is not a de Polignac number, because 221236349 - 2¹⁶ = 221170813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221236649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110618174 + 110618175.

It is an arithmetic number, because the mean of its divisors is an integer number (110618175).

Almost surely, 2^221236349 is an apocalyptic number.

It is an amenable number.

221236349 is a deficient number, since it is larger than the sum of its proper divisors (1).

221236349 is an equidigital number, since it uses as much as digits as its factorization.

221236349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 221236349 is about 14874.0159002201. The cubic root of 221236349 is about 604.8098111286.

The spelling of 221236349 in words is "two hundred twenty-one million, two hundred thirty-six thousand, three hundred forty-nine".