21140032 has 14 divisors (see below), whose sum is σ = 41949878. Its totient is φ = 10569984.

The previous prime is 21140011. The next prime is 21140033. The reversal of 21140032 is 23004112.

It can be written as a sum of positive squares in only one way, i.e., 17842176 + 3297856 = 4224^2 + 1816^2 .

It is a super-2 number, since 2×21140032² = 893801905922048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21139994 and 21140021.

It is not an unprimeable number, because it can be changed into a prime (21140033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165093 + ... + 165220.

Almost surely, 2^21140032 is an apocalyptic number.

It is an amenable number.

21140032 is a deficient number, since it is larger than the sum of its proper divisors (20809846).

21140032 is an equidigital number, since it uses as much as digits as its factorization.

21140032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330325 (or 330315 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21140032 is about 4597.8290529336. The cubic root of 21140032 is about 276.5042940079.

Adding to 21140032 its reverse (23004112), we get a palindrome (44144144).

The spelling of 21140032 in words is "twenty-one million, one hundred forty thousand, thirty-two".