21343023 has 24 divisors (see below), whose sum is σ = 34951280. Its totient is φ = 12441600.

The previous prime is 21343019. The next prime is 21343039. The reversal of 21343023 is 32034312.

21343023 is a `hidden beast` number, since 213 + 430 + 23 = 666.

It is not a de Polignac number, because 21343023 - 2² = 21343019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21342987 and 21343005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2578 + ... + 7023.

Almost surely, 2^21343023 is an apocalyptic number.

21343023 is a deficient number, since it is larger than the sum of its proper divisors (13608257).

21343023 is a wasteful number, since it uses less digits than its factorization.

21343023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9639 (or 9636 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21343023 is about 4619.8509716224. The cubic root of 21343023 is about 277.3864936322.

Adding to 21343023 its reverse (32034312), we get a palindrome (53377335).

The spelling of 21343023 in words is "twenty-one million, three hundred forty-three thousand, twenty-three".