21197032 has 16 divisors (see below), whose sum is σ = 40495140. Its totient is φ = 10398336.

The previous prime is 21197017. The next prime is 21197063. The reversal of 21197032 is 23079112.

It can be written as a sum of positive squares in 2 ways, for example, as 20376196 + 820836 = 4514^2 + 906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21196988 and 21197006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24573 + ... + 25420.

Almost surely, 2^21197032 is an apocalyptic number.

It is an amenable number.

21197032 is a deficient number, since it is larger than the sum of its proper divisors (19298108).

21197032 is a wasteful number, since it uses less digits than its factorization.

21197032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50052 (or 50048 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21197032 is about 4604.0234578030. The cubic root of 21197032 is about 276.7525844027.

The spelling of 21197032 in words is "twenty-one million, one hundred ninety-seven thousand, thirty-two".