21222433 has 2 divisors, whose sum is σ = 21222434. Its totient is φ = 21222432.

The previous prime is 21222401. The next prime is 21222469. The reversal of 21222433 is 33422212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14077504 + 7144929 = 3752^2 + 2673^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222433 - 2⁵ = 21222401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222433.

It is not a weakly prime, because it can be changed into another prime (21252433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611216 + 10611217.

It is an arithmetic number, because the mean of its divisors is an integer number (10611217).

Almost surely, 2^21222433 is an apocalyptic number.

It is an amenable number.

21222433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222433 is an equidigital number, since it uses as much as digits as its factorization.

21222433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 19.

The square root of 21222433 is about 4606.7811973221. The cubic root of 21222433 is about 276.8630870785.

Adding to 21222433 its reverse (33422212), we get a palindrome (54644645).

The spelling of 21222433 in words is "twenty-one million, two hundred twenty-two thousand, four hundred thirty-three".