21023343 has 24 divisors (see below), whose sum is σ = 33593040. Its totient is φ = 12562560.

The previous prime is 21023341. The next prime is 21023381. The reversal of 21023343 is 34332012.

It is not a de Polignac number, because 21023343 - 2¹ = 21023341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023341) 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, 5773 + ... + 8681.

It is an arithmetic number, because the mean of its divisors is an integer number (1399710).

Almost surely, 2^21023343 is an apocalyptic number.

21023343 is a deficient number, since it is larger than the sum of its proper divisors (12569697).

21023343 is a wasteful number, since it uses less digits than its factorization.

21023343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2999 (or 2996 counting only the distinct ones).

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

The square root of 21023343 is about 4585.1219176811. The cubic root of 21023343 is about 275.9946044944.

Adding to 21023343 its reverse (34332012), we get a palindrome (55355355).

It can be divided in two parts, 210233 and 43, that added together give a triangular number (210276 = T₆₄₈).

The spelling of 21023343 in words is "twenty-one million, twenty-three thousand, three hundred forty-three".