221422469 has 2 divisors, whose sum is σ = 221422470. Its totient is φ = 221422468.

The previous prime is 221422459. The next prime is 221422489. The reversal of 221422469 is 964224122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205922500 + 15499969 = 14350^2 + 3937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221422469 is a prime.

It is a super-2 number, since 2×221422469² = 98055819556111922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221422459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711234 + 110711235.

It is an arithmetic number, because the mean of its divisors is an integer number (110711235).

Almost surely, 2^221422469 is an apocalyptic number.

It is an amenable number.

221422469 is a deficient number, since it is larger than the sum of its proper divisors (1).

221422469 is an equidigital number, since it uses as much as digits as its factorization.

221422469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 32.

The square root of 221422469 is about 14880.2711332825. The cubic root of 221422469 is about 604.9793668259.

The spelling of 221422469 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred sixty-nine".