21323044 has 6 divisors (see below), whose sum is σ = 37315334. Its totient is φ = 10661520.

The previous prime is 21323021. The next prime is 21323053. The reversal of 21323044 is 44032312.

It can be written as a sum of positive squares in only one way, i.e., 16305444 + 5017600 = 4038^2 + 2240^2 .

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 as a sum of consecutive naturals, namely, 2665377 + ... + 2665384.

Almost surely, 2^21323044 is an apocalyptic number.

It is an amenable number.

21323044 is a deficient number, since it is larger than the sum of its proper divisors (15992290).

21323044 is a wasteful number, since it uses less digits than its factorization.

21323044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330765 (or 5330763 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21323044 is about 4617.6881661715. The cubic root of 21323044 is about 277.2999136618.

Adding to 21323044 its reverse (44032312), we get a palindrome (65355356).

The spelling of 21323044 in words is "twenty-one million, three hundred twenty-three thousand, forty-four".