21332871 has 24 divisors (see below), whose sum is σ = 35886240. Its totient is φ = 11958336.

The previous prime is 21332837. The next prime is 21332879. The reversal of 21332871 is 17823312.

It is not a de Polignac number, because 21332871 - 2⁹ = 21332359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332879) 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 23 ways as a sum of consecutive naturals, for example, 145 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (1495260).

Almost surely, 2^21332871 is an apocalyptic number.

21332871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21332871 is a deficient number, since it is larger than the sum of its proper divisors (14553369).

21332871 is a wasteful number, since it uses less digits than its factorization.

21332871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6455 (or 6452 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 21332871 is about 4618.7521041944. The cubic root of 21332871 is about 277.3425062006.

The spelling of 21332871 in words is "twenty-one million, three hundred thirty-two thousand, eight hundred seventy-one".