21433967 has 2 divisors, whose sum is σ = 21433968. Its totient is φ = 21433966.

The previous prime is 21433961. The next prime is 21433981. The reversal of 21433967 is 76933412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21433967 - 2¹⁸ = 21171823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21433961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716983 + 10716984.

It is an arithmetic number, because the mean of its divisors is an integer number (10716984).

Almost surely, 2^21433967 is an apocalyptic number.

21433967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433967 is an equidigital number, since it uses as much as digits as its factorization.

21433967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 21433967 is about 4629.6832505043. The cubic root of 21433967 is about 277.7799226086.

The spelling of 21433967 in words is "twenty-one million, four hundred thirty-three thousand, nine hundred sixty-seven".