21032144 has 20 divisors (see below), whose sum is σ = 46571424. Its totient is φ = 9013728.

The previous prime is 21032119. The next prime is 21032153. The reversal of 21032144 is 44123012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93782 + ... + 94005.

Almost surely, 2^21032144 is an apocalyptic number.

It is an amenable number.

21032144 is an abundant number, since it is smaller than the sum of its proper divisors (25539280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21032144 is a wasteful number, since it uses less digits than its factorization.

21032144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187802 (or 187796 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21032144 is about 4586.0815518261. The cubic root of 21032144 is about 276.0331123194.

Adding to 21032144 its reverse (44123012), we get a palindrome (65155156).

The spelling of 21032144 in words is "twenty-one million, thirty-two thousand, one hundred forty-four".