21133410 has 16 divisors (see below), whose sum is σ = 50720256. Its totient is φ = 5635568.

The previous prime is 21133403. The next prime is 21133423. The reversal of 21133410 is 1433112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21133410.

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, 352194 + ... + 352253.

It is an arithmetic number, because the mean of its divisors is an integer number (3170016).

Almost surely, 2^21133410 is an apocalyptic number.

21133410 is an abundant number, since it is smaller than the sum of its proper divisors (29586846).

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

21133410 is a wasteful number, since it uses less digits than its factorization.

21133410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704457.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21133410 is about 4597.1088740642. The cubic root of 21133410 is about 276.4754198376.

Adding to 21133410 its reverse (1433112), we get a palindrome (22566522).

The spelling of 21133410 in words is "twenty-one million, one hundred thirty-three thousand, four hundred ten".