21014233 has 2 divisors, whose sum is σ = 21014234. Its totient is φ = 21014232.

The previous prime is 21014179. The next prime is 21014239. The reversal of 21014233 is 33241012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18045504 + 2968729 = 4248^2 + 1723^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014233 - 2²¹ = 18917081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21014239) 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, 10507116 + 10507117.

It is an arithmetic number, because the mean of its divisors is an integer number (10507117).

Almost surely, 2^21014233 is an apocalyptic number.

It is an amenable number.

21014233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014233 is an equidigital number, since it uses as much as digits as its factorization.

21014233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21014233 is about 4584.1283795287. The cubic root of 21014233 is about 275.9547333520.

Adding to 21014233 its reverse (33241012), we get a palindrome (54255245).

The spelling of 21014233 in words is "twenty-one million, fourteen thousand, two hundred thirty-three".