21200546 has 8 divisors (see below), whose sum is σ = 31875564. Its totient is φ = 10575360.

The previous prime is 21200539. The next prime is 21200563. The reversal of 21200546 is 64500212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15124321 + 6076225 = 3889^2 + 2465^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 11375 + ... + 13106.

Almost surely, 2^21200546 is an apocalyptic number.

21200546 is a deficient number, since it is larger than the sum of its proper divisors (10675018).

21200546 is a wasteful number, since it uses less digits than its factorization.

21200546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24916.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21200546 is about 4604.4050647179. The cubic root of 21200546 is about 276.7678767142.

Adding to 21200546 its reverse (64500212), we get a palindrome (85700758).

The spelling of 21200546 in words is "twenty-one million, two hundred thousand, five hundred forty-six".