21033210 has 32 divisors (see below), whose sum is σ = 55069632. Its totient is φ = 5098880.

The previous prime is 21033203. The next prime is 21033223. The reversal of 21033210 is 1233012.

It is a happy number.

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31539 + ... + 32198.

It is an arithmetic number, because the mean of its divisors is an integer number (1720926).

Almost surely, 2^21033210 is an apocalyptic number.

21033210 is an abundant number, since it is smaller than the sum of its proper divisors (34036422).

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

21033210 is a wasteful number, since it uses less digits than its factorization.

21033210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63758.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21033210 is about 4586.1977715751. The cubic root of 21033210 is about 276.0377757578.

Adding to 21033210 its reverse (1233012), we get a palindrome (22266222).

The spelling of 21033210 in words is "twenty-one million, thirty-three thousand, two hundred ten".