21074432 has 20 divisors (see below), whose sum is σ = 42108726. Its totient is φ = 10536960.

The previous prime is 21074419. The next prime is 21074489. The reversal of 21074432 is 23447012.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 4946176 = 4016^2 + 2224^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21074398 and 21074407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069 + ... + 21092.

Almost surely, 2^21074432 is an apocalyptic number.

It is an amenable number.

21074432 is a deficient number, since it is larger than the sum of its proper divisors (21034294).

21074432 is an frugal number, since it uses more digits than its factorization.

21074432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41179 (or 41163 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 21074432 is about 4590.6897085296. The cubic root of 21074432 is about 276.2179892339.

The spelling of 21074432 in words is "twenty-one million, seventy-four thousand, four hundred thirty-two".