21533110 has 16 divisors (see below), whose sum is σ = 39661776. Its totient is φ = 8412768.

The previous prime is 21533047. The next prime is 21533111. The reversal of 21533110 is 1133512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533111) 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, 24609 + ... + 25468.

It is an arithmetic number, because the mean of its divisors is an integer number (2478861).

Almost surely, 2^21533110 is an apocalyptic number.

21533110 is a deficient number, since it is larger than the sum of its proper divisors (18128666).

21533110 is a wasteful number, since it uses less digits than its factorization.

21533110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50127.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21533110 is about 4640.3782173439. The cubic root of 21533110 is about 278.2075550915.

Adding to 21533110 its reverse (1133512), we get a palindrome (22666622).

The spelling of 21533110 in words is "twenty-one million, five hundred thirty-three thousand, one hundred ten".