21033411 has 16 divisors (see below), whose sum is σ = 32116224. Its totient is φ = 11994624.

The previous prime is 21033401. The next prime is 21033413. The reversal of 21033411 is 11433012.

It is not a de Polignac number, because 21033411 - 2⁶ = 21033347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16675 + ... + 17891.

It is an arithmetic number, because the mean of its divisors is an integer number (2007264).

Almost surely, 2^21033411 is an apocalyptic number.

21033411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21033411 is a deficient number, since it is larger than the sum of its proper divisors (11082813).

21033411 is a wasteful number, since it uses less digits than its factorization.

21033411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050.

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

The square root of 21033411 is about 4586.2196851001. The cubic root of 21033411 is about 276.0386550564.

Adding to 21033411 its reverse (11433012), we get a palindrome (32466423).

The spelling of 21033411 in words is "twenty-one million, thirty-three thousand, four hundred eleven".