21325144 has 16 divisors (see below), whose sum is σ = 42089400. Its totient is φ = 10101312.

The previous prime is 21325099. The next prime is 21325147. The reversal of 21325144 is 44152312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325147) 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 3 ways as a sum of consecutive naturals, for example, 69997 + ... + 70300.

Almost surely, 2^21325144 is an apocalyptic number.

It is an amenable number.

21325144 is a deficient number, since it is larger than the sum of its proper divisors (20764256).

21325144 is a wasteful number, since it uses less digits than its factorization.

21325144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140322 (or 140318 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21325144 is about 4617.9155470840. The cubic root of 21325144 is about 277.3090166570.

Adding to 21325144 its reverse (44152312), we get a palindrome (65477456).

The spelling of 21325144 in words is "twenty-one million, three hundred twenty-five thousand, one hundred forty-four".