21734971 has 4 divisors (see below), whose sum is σ = 22091344. Its totient is φ = 21378600.

The previous prime is 21734969. The next prime is 21734981. The reversal of 21734971 is 17943712.

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

It is a cyclic number.

It is not a de Polignac number, because 21734971 - 2¹ = 21734969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21734941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178095 + ... + 178216.

It is an arithmetic number, because the mean of its divisors is an integer number (5522836).

Almost surely, 2^21734971 is an apocalyptic number.

21734971 is a deficient number, since it is larger than the sum of its proper divisors (356373).

21734971 is an equidigital number, since it uses as much as digits as its factorization.

21734971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356372.

The product of its digits is 10584, while the sum is 34.

The square root of 21734971 is about 4662.0779701760. The cubic root of 21734971 is about 279.0741999348.

The spelling of 21734971 in words is "twenty-one million, seven hundred thirty-four thousand, nine hundred seventy-one".