21223534 has 16 divisors (see below), whose sum is σ = 33268320. Its totient is φ = 10141600.

The previous prime is 21223519. The next prime is 21223583. The reversal of 21223534 is 43532212.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4047 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (2079270).

Almost surely, 2^21223534 is an apocalyptic number.

21223534 is a deficient number, since it is larger than the sum of its proper divisors (12044786).

21223534 is a wasteful number, since it uses less digits than its factorization.

21223534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755.

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

The square root of 21223534 is about 4606.9006935249. The cubic root of 21223534 is about 276.8678747952.

Adding to 21223534 its reverse (43532212), we get a palindrome (64755746).

The spelling of 21223534 in words is "twenty-one million, two hundred twenty-three thousand, five hundred thirty-four".