21140832 has 24 divisors (see below), whose sum is σ = 55494936. Its totient is φ = 7046912.

The previous prime is 21140827. The next prime is 21140837. The reversal of 21140832 is 23804112.

It is an interprime number because it is at equal distance from previous prime (21140827) and next prime (21140837).

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 21140799 and 21140808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110013 + ... + 110204.

It is an arithmetic number, because the mean of its divisors is an integer number (2312289).

Almost surely, 2^21140832 is an apocalyptic number.

It is an amenable number.

21140832 is an abundant number, since it is smaller than the sum of its proper divisors (34354104).

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

21140832 is a wasteful number, since it uses less digits than its factorization.

21140832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220230 (or 220222 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21140832 is about 4597.9160496903. The cubic root of 21140832 is about 276.5077818715.

Adding to 21140832 its reverse (23804112), we get a palindrome (44944944).

The spelling of 21140832 in words is "twenty-one million, one hundred forty thousand, eight hundred thirty-two".