21434322 has 64 divisors (see below), whose sum is σ = 54238464. Its totient is φ = 5495040.

The previous prime is 21434293. The next prime is 21434323. The reversal of 21434322 is 22343412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21434323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19672 + ... + 20732.

It is an arithmetic number, because the mean of its divisors is an integer number (847476).

Almost surely, 2^21434322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21434322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27119232).

21434322 is an abundant number, since it is smaller than the sum of its proper divisors (32804142).

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

21434322 is a wasteful number, since it uses less digits than its factorization.

21434322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123.

The product of its digits is 1152, while the sum is 21.

The square root of 21434322 is about 4629.7215899015. The cubic root of 21434322 is about 277.7814561765.

Adding to 21434322 its reverse (22343412), we get a palindrome (43777734).

The spelling of 21434322 in words is "twenty-one million, four hundred thirty-four thousand, three hundred twenty-two".