21332811 has 8 divisors (see below), whose sum is σ = 28490560. Its totient is φ = 14198472.

The previous prime is 21332797. The next prime is 21332813. The reversal of 21332811 is 11823312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21332811 - 2¹³ = 21324619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332813) 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 7 ways as a sum of consecutive naturals, for example, 3601 + ... + 7458.

It is an arithmetic number, because the mean of its divisors is an integer number (3561320).

Almost surely, 2^21332811 is an apocalyptic number.

21332811 is a deficient number, since it is larger than the sum of its proper divisors (7157749).

21332811 is a wasteful number, since it uses less digits than its factorization.

21332811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11705.

The product of its digits is 288, while the sum is 21.

The square root of 21332811 is about 4618.7456089289. The cubic root of 21332811 is about 277.3422461861.

The spelling of 21332811 in words is "twenty-one million, three hundred thirty-two thousand, eight hundred eleven".