21433023 has 12 divisors (see below), whose sum is σ = 31279248. Its totient is φ = 14140800.

The previous prime is 21432991. The next prime is 21433051. The reversal of 21433023 is 32033412.

It is not a de Polignac number, because 21433023 - 2⁵ = 21432991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21432987 and 21433005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11403 + ... + 13148.

It is an arithmetic number, because the mean of its divisors is an integer number (2606604).

Almost surely, 2^21433023 is an apocalyptic number.

21433023 is a deficient number, since it is larger than the sum of its proper divisors (9846225).

21433023 is a wasteful number, since it uses less digits than its factorization.

21433023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24654 (or 24651 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21433023 is about 4629.5812985625. The cubic root of 21433023 is about 277.7758445317.

Adding to 21433023 its reverse (32033412), we get a palindrome (53466435).

The spelling of 21433023 in words is "twenty-one million, four hundred thirty-three thousand, twenty-three".