21433124 has 12 divisors (see below), whose sum is σ = 39714444. Its totient is φ = 10086144.

The previous prime is 21433123. The next prime is 21433127. The reversal of 21433124 is 42133412.

It can be written as a sum of positive squares in 2 ways, for example, as 8702500 + 12730624 = 2950^2 + 3568^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21433096 and 21433105.

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 3 ways as a sum of consecutive naturals, for example, 157529 + ... + 157664.

It is an arithmetic number, because the mean of its divisors is an integer number (3309537).

Almost surely, 2^21433124 is an apocalyptic number.

It is an amenable number.

21433124 is a deficient number, since it is larger than the sum of its proper divisors (18281320).

21433124 is a wasteful number, since it uses less digits than its factorization.

21433124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315214 (or 315212 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 21433124 is about 4629.5922066636. The cubic root of 21433124 is about 277.7762808571.

Adding to 21433124 its reverse (42133412), we get a palindrome (63566536).

The spelling of 21433124 in words is "twenty-one million, four hundred thirty-three thousand, one hundred twenty-four".