21034732 has 6 divisors (see below), whose sum is σ = 36810788. Its totient is φ = 10517364.

The previous prime is 21034723. The next prime is 21034733. The reversal of 21034732 is 23743012.

It is not an unprimeable number, because it can be changed into a prime (21034733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629338 + ... + 2629345.

Almost surely, 2^21034732 is an apocalyptic number.

It is an amenable number.

21034732 is a deficient number, since it is larger than the sum of its proper divisors (15776056).

21034732 is a wasteful number, since it uses less digits than its factorization.

21034732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5258687 (or 5258685 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21034732 is about 4586.3637012343. The cubic root of 21034732 is about 276.0444337899.

Adding to 21034732 its reverse (23743012), we get a palindrome (44777744).

The spelling of 21034732 in words is "twenty-one million, thirty-four thousand, seven hundred thirty-two".