21210482 has 4 divisors (see below), whose sum is σ = 31815726. Its totient is φ = 10605240.

The previous prime is 21210463. The next prime is 21210487. The reversal of 21210482 is 28401212.

It is a happy number.

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., 13697401 + 7513081 = 3701^2 + 2741^2 .

It is not an unprimeable number, because it can be changed into a prime (21210487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302619 + ... + 5302622.

Almost surely, 2^21210482 is an apocalyptic number.

21210482 is a deficient number, since it is larger than the sum of its proper divisors (10605244).

21210482 is a wasteful number, since it uses less digits than its factorization.

21210482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605243.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21210482 is about 4605.4839050853. The cubic root of 21210482 is about 276.8111073010.

Adding to 21210482 its reverse (28401212), we get a palindrome (49611694).

The spelling of 21210482 in words is "twenty-one million, two hundred ten thousand, four hundred eighty-two".