21433416 has 16 divisors (see below), whose sum is σ = 53583600. Its totient is φ = 7144464.

The previous prime is 21433361. The next prime is 21433417. The reversal of 21433416 is 61433412.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 893059 = 21433416 / (2 + 1 + 4 + 3 + 3 + 4 + 1 + 6).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21433417) 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, 446506 + ... + 446553.

It is an arithmetic number, because the mean of its divisors is an integer number (3348975).

Almost surely, 2^21433416 is an apocalyptic number.

It is an amenable number.

21433416 is an abundant number, since it is smaller than the sum of its proper divisors (32150184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21433416 is a wasteful number, since it uses less digits than its factorization.

21433416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893068 (or 893064 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 21433416 is about 4629.6237428111. The cubic root of 21433416 is about 277.7775423050. Note that the first 3 decimals are identical.

Adding to 21433416 its reverse (61433412), we get a palindrome (82866828).

The spelling of 21433416 in words is "twenty-one million, four hundred thirty-three thousand, four hundred sixteen".