221427307 has 2 divisors, whose sum is σ = 221427308. Its totient is φ = 221427306.

The previous prime is 221427289. The next prime is 221427361. The reversal of 221427307 is 703724122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221427307 - 2⁷ = 221427179 is a prime.

It is equal to p_12196801 and since 221427307 and 12196801 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (221427707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110713653 + 110713654.

It is an arithmetic number, because the mean of its divisors is an integer number (110713654).

Almost surely, 2^221427307 is an apocalyptic number.

221427307 is a deficient number, since it is larger than the sum of its proper divisors (1).

221427307 is an equidigital number, since it uses as much as digits as its factorization.

221427307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 221427307 is about 14880.4336966367. The cubic root of 221427307 is about 604.9837729864.

The spelling of 221427307 in words is "two hundred twenty-one million, four hundred twenty-seven thousand, three hundred seven".