21344250 has 64 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 5624000.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344250 is 5244312.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111655 + ... + 111845.

It is an arithmetic number, because the mean of its divisors is an integer number (842400).

Almost surely, 2^21344250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21344250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26956800).

21344250 is an abundant number, since it is smaller than the sum of its proper divisors (32569350).

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

21344250 is a wasteful number, since it uses less digits than its factorization.

21344250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21344250 is about 4619.9837662052. The cubic root of 21344250 is about 277.3918091351.

Adding to 21344250 its reverse (5244312), we get a palindrome (26588562).

The spelling of 21344250 in words is "twenty-one million, three hundred forty-four thousand, two hundred fifty".