221814407 has 2 divisors, whose sum is σ = 221814408. Its totient is φ = 221814406.

The previous prime is 221814391. The next prime is 221814427. The reversal of 221814407 is 704418122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221814407 - 2⁴ = 221814391 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221814407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221814427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110907203 + 110907204.

It is an arithmetic number, because the mean of its divisors is an integer number (110907204).

Almost surely, 2^221814407 is an apocalyptic number.

221814407 is a deficient number, since it is larger than the sum of its proper divisors (1).

221814407 is an equidigital number, since it uses as much as digits as its factorization.

221814407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 221814407 is about 14893.4350302407. The cubic root of 221814407 is about 605.3361126684.

The spelling of 221814407 in words is "two hundred twenty-one million, eight hundred fourteen thousand, four hundred seven".