21234871 has 8 divisors (see below), whose sum is σ = 24331040. Its totient is φ = 18154368.

The previous prime is 21234841. The next prime is 21234877. The reversal of 21234871 is 17843212.

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

It is a cyclic number.

It is not a de Polignac number, because 21234871 - 2²¹ = 19137719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (3041380).

Almost surely, 2^21234871 is an apocalyptic number.

21234871 is a deficient number, since it is larger than the sum of its proper divisors (3096169).

21234871 is an equidigital number, since it uses as much as digits as its factorization.

21234871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7833.

The product of its digits is 2688, while the sum is 28.

The square root of 21234871 is about 4608.1309660208. The cubic root of 21234871 is about 276.9171642988.

The spelling of 21234871 in words is "twenty-one million, two hundred thirty-four thousand, eight hundred seventy-one".