21133011 has 4 divisors (see below), whose sum is σ = 28177352. Its totient is φ = 14088672.

The previous prime is 21133009. The next prime is 21133027. The reversal of 21133011 is 11033112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21133011 - 2¹ = 21133009 is a prime.

It is a super-2 number, since 2×21133011² = 893208307852242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21132011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3522166 + ... + 3522171.

It is an arithmetic number, because the mean of its divisors is an integer number (7044338).

Almost surely, 2^21133011 is an apocalyptic number.

21133011 is a deficient number, since it is larger than the sum of its proper divisors (7044341).

21133011 is an equidigital number, since it uses as much as digits as its factorization.

21133011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044340.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 21133011 is about 4597.0654770190. The cubic root of 21133011 is about 276.4736798694.

Adding to 21133011 its reverse (11033112), we get a palindrome (32166123).

The spelling of 21133011 in words is "twenty-one million, one hundred thirty-three thousand, eleven".