21453482 has 4 divisors (see below), whose sum is σ = 32180226. Its totient is φ = 10726740.

The previous prime is 21453469. The next prime is 21453493. The reversal of 21453482 is 28435412.

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., 20529961 + 923521 = 4531^2 + 961^2 .

It is a plaindrome in base 11.

It is an unprimeable number.

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, 5363369 + ... + 5363372.

Almost surely, 2^21453482 is an apocalyptic number.

21453482 is a deficient number, since it is larger than the sum of its proper divisors (10726744).

21453482 is a wasteful number, since it uses less digits than its factorization.

21453482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10726743.

The product of its digits is 7680, while the sum is 29.

The square root of 21453482 is about 4631.7903665861. The cubic root of 21453482 is about 277.8642005344.

Adding to 21453482 its reverse (28435412), we get a palindrome (49888894).

The spelling of 21453482 in words is "twenty-one million, four hundred fifty-three thousand, four hundred eighty-two".