21033110 has 32 divisors (see below), whose sum is σ = 43467840. Its totient is φ = 7178112.

The previous prime is 21033083. The next prime is 21033119. The reversal of 21033110 is 1133012.

It is a junction number, because it is equal to n+sod(n) for n = 21033091 and 21033100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18272 + ... + 19388.

It is an arithmetic number, because the mean of its divisors is an integer number (1358370).

Almost surely, 2^21033110 is an apocalyptic number.

21033110 is an abundant number, since it is smaller than the sum of its proper divisors (22434730).

21033110 is a wasteful number, since it uses less digits than its factorization.

21033110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21033110 is about 4586.1868692848. The cubic root of 21033110 is about 276.0373382937.

Adding to 21033110 its reverse (1133012), we get a palindrome (22166122).

The spelling of 21033110 in words is "twenty-one million, thirty-three thousand, one hundred ten".