21133546 has 16 divisors (see below), whose sum is σ = 36298944. Its totient is φ = 9039744.

The previous prime is 21133523. The next prime is 21133559. The reversal of 21133546 is 64533112.

It is a self number, because there is not a number n which added to its sum of digits gives 21133546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8301 + ... + 10543.

It is an arithmetic number, because the mean of its divisors is an integer number (2268684).

Almost surely, 2^21133546 is an apocalyptic number.

21133546 is a deficient number, since it is larger than the sum of its proper divisors (15165398).

21133546 is a wasteful number, since it uses less digits than its factorization.

21133546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925.

The product of its digits is 2160, while the sum is 25.

The square root of 21133546 is about 4597.1236659459. The cubic root of 21133546 is about 276.4760129045.

Adding to 21133546 its reverse (64533112), we get a palindrome (85666658).

The spelling of 21133546 in words is "twenty-one million, one hundred thirty-three thousand, five hundred forty-six".