21322434 has 32 divisors (see below), whose sum is σ = 50057856. Its totient is φ = 5927040.

The previous prime is 21322417. The next prime is 21322439. The reversal of 21322434 is 43422312.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21322434.

It is not an unprimeable number, because it can be changed into a prime (21322439) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5307 + ... + 8414.

It is an arithmetic number, because the mean of its divisors is an integer number (1564308).

Almost surely, 2^21322434 is an apocalyptic number.

21322434 is an abundant number, since it is smaller than the sum of its proper divisors (28735422).

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

21322434 is a wasteful number, since it uses less digits than its factorization.

21322434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13770.

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

The square root of 21322434 is about 4617.6221153317. The cubic root of 21322434 is about 277.2972693464.

Adding to 21322434 its reverse (43422312), we get a palindrome (64744746).

The spelling of 21322434 in words is "twenty-one million, three hundred twenty-two thousand, four hundred thirty-four".