221814427 has 2 divisors, whose sum is σ = 221814428. Its totient is φ = 221814426.

The previous prime is 221814407. The next prime is 221814457. The reversal of 221814427 is 724418122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221814427 is a prime.

It is not a weakly prime, because it can be changed into another prime (221814407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110907213 + 110907214.

It is an arithmetic number, because the mean of its divisors is an integer number (110907214).

Almost surely, 2^221814427 is an apocalyptic number.

221814427 is a deficient number, since it is larger than the sum of its proper divisors (1).

221814427 is an equidigital number, since it uses as much as digits as its factorization.

221814427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 31.

The square root of 221814427 is about 14893.4357016774. The cubic root of 221814427 is about 605.3361308619.

The spelling of 221814427 in words is "two hundred twenty-one million, eight hundred fourteen thousand, four hundred twenty-seven".