21127232 has 42 divisors (see below), whose sum is σ = 48776382. Its totient is φ = 9053184.

The previous prime is 21127217. The next prime is 21127241. The reversal of 21127232 is 23272112.

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 3013696 = 4256^2 + 1736^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 233 + ... + 6504.

Almost surely, 2^21127232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21127232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24388191).

21127232 is an abundant number, since it is smaller than the sum of its proper divisors (27649150).

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

21127232 is an equidigital number, since it uses as much as digits as its factorization.

21127232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6763 (or 6746 counting only the distinct ones).

The product of its digits is 336, while the sum is 20.

The square root of 21127232 is about 4596.4368808894. The cubic root of 21127232 is about 276.4484762191.

Adding to 21127232 its reverse (23272112), we get a palindrome (44399344).

The spelling of 21127232 in words is "twenty-one million, one hundred twenty-seven thousand, two hundred thirty-two".