21133746 has 24 divisors (see below), whose sum is σ = 46238400. Its totient is φ = 6975576.

The previous prime is 21133733. The next prime is 21133747. The reversal of 21133746 is 64733112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21133747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3846 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (1926600).

Almost surely, 2^21133746 is an apocalyptic number.

21133746 is an abundant number, since it is smaller than the sum of its proper divisors (25104654).

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

21133746 is a wasteful number, since it uses less digits than its factorization.

21133746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510 (or 11507 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 21133746 is about 4597.1454186267. The cubic root of 21133746 is about 276.4768850571.

Adding to 21133746 its reverse (64733112), we get a palindrome (85866858).

The spelling of 21133746 in words is "twenty-one million, one hundred thirty-three thousand, seven hundred forty-six".