21343522 has 16 divisors (see below), whose sum is σ = 32586552. Its totient is φ = 10483200.

The previous prime is 21343519. The next prime is 21343579. The reversal of 21343522 is 22534312.

It can be written as a sum of positive squares in 4 ways, for example, as 19545241 + 1798281 = 4421^2 + 1341^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21343493 and 21343502.

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 7 ways as a sum of consecutive naturals, for example, 31378 + ... + 32050.

Almost surely, 2^21343522 is an apocalyptic number.

21343522 is a deficient number, since it is larger than the sum of its proper divisors (11243030).

21343522 is a wasteful number, since it uses less digits than its factorization.

21343522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

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

The square root of 21343522 is about 4619.9049773778. The cubic root of 21343522 is about 277.3886553813.

Adding to 21343522 its reverse (22534312), we get a palindrome (43877834).

The spelling of 21343522 in words is "twenty-one million, three hundred forty-three thousand, five hundred twenty-two".