21534322 has 4 divisors (see below), whose sum is σ = 32301486. Its totient is φ = 10767160.

The previous prime is 21534301. The next prime is 21534323. The reversal of 21534322 is 22343512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 3463321 = 4251^2 + 1861^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21534293 and 21534302.

It is not an unprimeable number, because it can be changed into a prime (21534323) 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 as a sum of consecutive naturals, namely, 5383579 + ... + 5383582.

Almost surely, 2^21534322 is an apocalyptic number.

21534322 is a deficient number, since it is larger than the sum of its proper divisors (10767164).

21534322 is a wasteful number, since it uses less digits than its factorization.

21534322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10767163.

The product of its digits is 1440, while the sum is 22.

The square root of 21534322 is about 4640.5088083097. The cubic root of 21534322 is about 278.2127746693.

Adding to 21534322 its reverse (22343512), we get a palindrome (43877834).

The spelling of 21534322 in words is "twenty-one million, five hundred thirty-four thousand, three hundred twenty-two".