21470032 has 10 divisors (see below), whose sum is σ = 41598218. Its totient is φ = 10735008.

The previous prime is 21469999. The next prime is 21470047. The reversal of 21470032 is 23007412.

It can be written as a sum of positive squares in only one way, i.e., 21013056 + 456976 = 4584^2 + 676^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21469991 and 21470009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670923 + ... + 670954.

Almost surely, 2^21470032 is an apocalyptic number.

It is an amenable number.

21470032 is a deficient number, since it is larger than the sum of its proper divisors (20128186).

21470032 is a wasteful number, since it uses less digits than its factorization.

21470032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341885 (or 1341879 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21470032 is about 4633.5765883386. The cubic root of 21470032 is about 277.9356337016.

Adding to 21470032 its reverse (23007412), we get a palindrome (44477444).

The spelling of 21470032 in words is "twenty-one million, four hundred seventy thousand, thirty-two".