21343432 has 48 divisors (see below), whose sum is σ = 46611180. Its totient is φ = 9123840.

The previous prime is 21343429. The next prime is 21343451. The reversal of 21343432 is 23434312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16208676 + 5134756 = 4026^2 + 2266^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15808 + ... + 17104.

Almost surely, 2^21343432 is an apocalyptic number.

21343432 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 21343432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23305590).

21343432 is an abundant number, since it is smaller than the sum of its proper divisors (25267748).

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

21343432 is a wasteful number, since it uses less digits than its factorization.

21343432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1327 counting only the distinct ones).

The product of its digits is 1728, while the sum is 22.

The square root of 21343432 is about 4619.8952369074. The cubic root of 21343432 is about 277.3882654891.

Adding to 21343432 its reverse (23434312), we get a palindrome (44777744).

The spelling of 21343432 in words is "twenty-one million, three hundred forty-three thousand, four hundred thirty-two".