21433412 has 96 divisors (see below), whose sum is σ = 51819264. Its totient is φ = 7488000.

The previous prime is 21433361. The next prime is 21433417.

21433412 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21433412² = 918782299923488, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 212162 + ... + 212262.

It is an arithmetic number, because the mean of its divisors is an integer number (539784).

Almost surely, 2^21433412 is an apocalyptic number.

21433412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21433412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25909632).

21433412 is an abundant number, since it is smaller than the sum of its proper divisors (30385852).

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

21433412 is a wasteful number, since it uses less digits than its factorization.

21433412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 187 counting only the distinct ones).

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

The square root of 21433412 is about 4629.6233108105. The cubic root of 21433412 is about 277.7775250250. Note that the first 3 decimals are identical.

It can be divided in two parts, 2143 and 3412, that added together give a palindrome (5555).

The spelling of 21433412 in words is "twenty-one million, four hundred thirty-three thousand, four hundred twelve".