221468789 has 2 divisors, whose sum is σ = 221468790. Its totient is φ = 221468788.

The previous prime is 221468783. The next prime is 221468827. The reversal of 221468789 is 987864122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214124689 + 7344100 = 14633^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 221468789 - 2⁴ = 221468773 is a prime.

It is a super-2 number, since 2×221468789² = 98096849002253042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221468783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110734394 + 110734395.

It is an arithmetic number, because the mean of its divisors is an integer number (110734395).

Almost surely, 2^221468789 is an apocalyptic number.

It is an amenable number.

221468789 is a deficient number, since it is larger than the sum of its proper divisors (1).

221468789 is an equidigital number, since it uses as much as digits as its factorization.

221468789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 221468789 is about 14881.8274751457. The cubic root of 221468789 is about 605.0215496730.

The spelling of 221468789 in words is "two hundred twenty-one million, four hundred sixty-eight thousand, seven hundred eighty-nine".