21533046 has 16 divisors (see below), whose sum is σ = 43377600. Its totient is φ = 7125768.

The previous prime is 21533011. The next prime is 21533047. The reversal of 21533046 is 64033512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12076 + ... + 13743.

It is an arithmetic number, because the mean of its divisors is an integer number (2711100).

Almost surely, 2^21533046 is an apocalyptic number.

21533046 is an abundant number, since it is smaller than the sum of its proper divisors (21844554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21533046 is a wasteful number, since it uses less digits than its factorization.

21533046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25963.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21533046 is about 4640.3713213492. The cubic root of 21533046 is about 278.2072794648.

Adding to 21533046 its reverse (64033512), we get a palindrome (85566558).

The spelling of 21533046 in words is "twenty-one million, five hundred thirty-three thousand, forty-six".