21032438 has 16 divisors (see below), whose sum is σ = 36668160. Its totient is φ = 8860776.

The previous prime is 21032437. The next prime is 21032441. The reversal of 21032438 is 83423012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11906 + ... + 13557.

It is an arithmetic number, because the mean of its divisors is an integer number (2291760).

Almost surely, 2^21032438 is an apocalyptic number.

21032438 is a deficient number, since it is larger than the sum of its proper divisors (15635722).

21032438 is a wasteful number, since it uses less digits than its factorization.

21032438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25531.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21032438 is about 4586.1136052217. The cubic root of 21032438 is about 276.0343984992.

The spelling of 21032438 in words is "twenty-one million, thirty-two thousand, four hundred thirty-eight".