21133210 has 96 divisors (see below), whose sum is σ = 48755520. Its totient is φ = 6547968.

The previous prime is 21133153. The next prime is 21133213. The reversal of 21133210 is 1233112.

It is a super-2 number, since 2×21133210² = 893225129808200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21133213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 358161 + ... + 358219.

It is an arithmetic number, because the mean of its divisors is an integer number (507870).

Almost surely, 2^21133210 is an apocalyptic number.

21133210 is an abundant number, since it is smaller than the sum of its proper divisors (27622310).

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

21133210 is a wasteful number, since it uses less digits than its factorization.

21133210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21133210 is about 4597.0871212106. The cubic root of 21133210 is about 276.4745476758.

Adding to 21133210 its reverse (1233112), we get a palindrome (22366322).

The spelling of 21133210 in words is "twenty-one million, one hundred thirty-three thousand, two hundred ten".