21498746 has 4 divisors (see below), whose sum is σ = 32248122. Its totient is φ = 10749372.

The previous prime is 21498733. The next prime is 21498793. The reversal of 21498746 is 64789412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13875625 + 7623121 = 3725^2 + 2761^2 .

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 as a sum of consecutive naturals, namely, 5374685 + ... + 5374688.

Almost surely, 2^21498746 is an apocalyptic number.

21498746 is a deficient number, since it is larger than the sum of its proper divisors (10749376).

21498746 is a wasteful number, since it uses less digits than its factorization.

21498746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749375.

The product of its digits is 96768, while the sum is 41.

The square root of 21498746 is about 4636.6740234785. The cubic root of 21498746 is about 278.0594821222.

The spelling of 21498746 in words is "twenty-one million, four hundred ninety-eight thousand, seven hundred forty-six".