21348423 has 12 divisors (see below), whose sum is σ = 30897568. Its totient is φ = 14204160.

The previous prime is 21348421. The next prime is 21348433. The reversal of 21348423 is 32484312.

It is not a de Polignac number, because 21348423 - 2¹ = 21348421 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 (21348421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3138 + ... + 7248.

Almost surely, 2^21348423 is an apocalyptic number.

21348423 is a deficient number, since it is larger than the sum of its proper divisors (9549145).

21348423 is a wasteful number, since it uses less digits than its factorization.

21348423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694 (or 4691 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21348423 is about 4620.4353690967. The cubic root of 21348423 is about 277.4098855193.

The spelling of 21348423 in words is "twenty-one million, three hundred forty-eight thousand, four hundred twenty-three".