21433219 has 2 divisors, whose sum is σ = 21433220. Its totient is φ = 21433218.

The previous prime is 21433213. The next prime is 21433231. The reversal of 21433219 is 91233412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21433219 - 2¹⁵ = 21400451 is a prime.

It is a super-2 number, since 2×21433219² = 918765753403922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21433193 and 21433202.

It is not a weakly prime, because it can be changed into another prime (21433213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716609 + 10716610.

It is an arithmetic number, because the mean of its divisors is an integer number (10716610).

Almost surely, 2^21433219 is an apocalyptic number.

21433219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433219 is an equidigital number, since it uses as much as digits as its factorization.

21433219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 21433219 is about 4629.6024667351. The cubic root of 21433219 is about 277.7766912609.

It can be divided in two parts, 214 and 33219, that added together give a palindrome (33433).

The spelling of 21433219 in words is "twenty-one million, four hundred thirty-three thousand, two hundred nineteen".