21041330 has 32 divisors (see below), whose sum is σ = 38864448. Its totient is φ = 8200000.

The previous prime is 21041309. The next prime is 21041353. The reversal of 21041330 is 3314012.

It is a Curzon number.

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, 83705 + ... + 83955.

It is an arithmetic number, because the mean of its divisors is an integer number (1214514).

Almost surely, 2^21041330 is an apocalyptic number.

21041330 is a deficient number, since it is larger than the sum of its proper divisors (17823118).

21041330 is a wasteful number, since it uses less digits than its factorization.

21041330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21041330 is about 4587.0829510703. The cubic root of 21041330 is about 276.0732932143.

Adding to 21041330 its reverse (3314012), we get a palindrome (24355342).

The spelling of 21041330 in words is "twenty-one million, forty-one thousand, three hundred thirty".