21734423 has 8 divisors (see below), whose sum is σ = 23137200. Its totient is φ = 20357568.

The previous prime is 21734417. The next prime is 21734431. The reversal of 21734423 is 32443712.

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 21734423 - 2²² = 17540119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21734392 and 21734401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734443) 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, 4736 + ... + 8117.

It is an arithmetic number, because the mean of its divisors is an integer number (2892150).

Almost surely, 2^21734423 is an apocalyptic number.

21734423 is a deficient number, since it is larger than the sum of its proper divisors (1402777).

21734423 is a wasteful number, since it uses less digits than its factorization.

21734423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12961.

The product of its digits is 4032, while the sum is 26.

The square root of 21734423 is about 4662.0191977297. The cubic root of 21734423 is about 279.0718544989.

The spelling of 21734423 in words is "twenty-one million, seven hundred thirty-four thousand, four hundred twenty-three".