21491482 has 8 divisors (see below), whose sum is σ = 32285952. Its totient is φ = 10729500.

The previous prime is 21491473. The next prime is 21491513. The reversal of 21491482 is 28419412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6394 + ... + 9157.

It is an arithmetic number, because the mean of its divisors is an integer number (4035744).

Almost surely, 2^21491482 is an apocalyptic number.

21491482 is a deficient number, since it is larger than the sum of its proper divisors (10794470).

21491482 is a wasteful number, since it uses less digits than its factorization.

21491482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16244.

The product of its digits is 4608, while the sum is 31.

The square root of 21491482 is about 4635.8906371915. The cubic root of 21491482 is about 278.0281616658.

The spelling of 21491482 in words is "twenty-one million, four hundred ninety-one thousand, four hundred eighty-two".