21133130 has 16 divisors (see below), whose sum is σ = 40042080. Its totient is φ = 8008272.

The previous prime is 21133121. The next prime is 21133153. The reversal of 21133130 is 3133112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55424 + ... + 55803.

It is an arithmetic number, because the mean of its divisors is an integer number (2502630).

Almost surely, 2^21133130 is an apocalyptic number.

21133130 is a deficient number, since it is larger than the sum of its proper divisors (18908950).

21133130 is a wasteful number, since it uses less digits than its factorization.

21133130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111253.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21133130 is about 4597.0784200403. The cubic root of 21133130 is about 276.4741988096.

Adding to 21133130 its reverse (3133112), we get a palindrome (24266242).

The spelling of 21133130 in words is "twenty-one million, one hundred thirty-three thousand, one hundred thirty".