21346871 has 16 divisors (see below), whose sum is σ = 27182400. Its totient is φ = 16305408.

The previous prime is 21346867. The next prime is 21346873. The reversal of 21346871 is 17864312.

It is not a de Polignac number, because 21346871 - 2² = 21346867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1406 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (1698900).

Almost surely, 2^21346871 is an apocalyptic number.

21346871 is a deficient number, since it is larger than the sum of its proper divisors (5835529).

21346871 is a wasteful number, since it uses less digits than its factorization.

21346871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8138.

The product of its digits is 8064, while the sum is 32.

The square root of 21346871 is about 4620.2674165031. The cubic root of 21346871 is about 277.4031629217.

The spelling of 21346871 in words is "twenty-one million, three hundred forty-six thousand, eight hundred seventy-one".