221433389 has 2 divisors, whose sum is σ = 221433390. Its totient is φ = 221433388.

The previous prime is 221433371. The next prime is 221433427. The reversal of 221433389 is 983334122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197177764 + 24255625 = 14042^2 + 4925^2 .

It is a cyclic number.

It is not a de Polignac number, because 221433389 - 2²⁴ = 204656173 is a prime.

It is a super-3 number, since 3×221433389³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221433349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110716694 + 110716695.

It is an arithmetic number, because the mean of its divisors is an integer number (110716695).

Almost surely, 2^221433389 is an apocalyptic number.

It is an amenable number.

221433389 is a deficient number, since it is larger than the sum of its proper divisors (1).

221433389 is an equidigital number, since it uses as much as digits as its factorization.

221433389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 221433389 is about 14880.6380575565. The cubic root of 221433389 is about 604.9893120166.

The spelling of 221433389 in words is "two hundred twenty-one million, four hundred thirty-three thousand, three hundred eighty-nine".