21340248 has 16 divisors (see below), whose sum is σ = 53350680. Its totient is φ = 7113408.

The previous prime is 21340247. The next prime is 21340273. The reversal of 21340248 is 84204312.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 889177 = 21340248 / (2 + 1 + 3 + 4 + 0 + 2 + 4 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340243) 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, 444565 + ... + 444612.

Almost surely, 2^21340248 is an apocalyptic number.

It is an amenable number.

21340248 is an abundant number, since it is smaller than the sum of its proper divisors (32010432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21340248 is a wasteful number, since it uses less digits than its factorization.

21340248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889186 (or 889182 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 21340248 is about 4619.5506274961. The cubic root of 21340248 is about 277.3744712665.

The spelling of 21340248 in words is "twenty-one million, three hundred forty thousand, two hundred forty-eight".