21433207 has 2 divisors, whose sum is σ = 21433208. Its totient is φ = 21433206.

The previous prime is 21433163. The next prime is 21433213. The reversal of 21433207 is 70233412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21433207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21433507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716603 + 10716604.

It is an arithmetic number, because the mean of its divisors is an integer number (10716604).

Almost surely, 2^21433207 is an apocalyptic number.

21433207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433207 is an equidigital number, since it uses as much as digits as its factorization.

21433207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21433207 is about 4629.6011707273. The cubic root of 21433207 is about 277.7766394205.

Adding to 21433207 its reverse (70233412), we get a palindrome (91666619).

The spelling of 21433207 in words is "twenty-one million, four hundred thirty-three thousand, two hundred seven".