21375268 has 12 divisors (see below), whose sum is σ = 38319372. Its totient is φ = 10426880.

The previous prime is 21375253. The next prime is 21375293. The reversal of 21375268 is 86257312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12802084 + 8573184 = 3578^2 + 2928^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65005 + ... + 65332.

It is an arithmetic number, because the mean of its divisors is an integer number (3193281).

Almost surely, 2^21375268 is an apocalyptic number.

It is an amenable number.

21375268 is a deficient number, since it is larger than the sum of its proper divisors (16944104).

21375268 is a wasteful number, since it uses less digits than its factorization.

21375268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130382 (or 130380 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 21375268 is about 4623.3394856965. The cubic root of 21375268 is about 277.5261150111.

The spelling of 21375268 in words is "twenty-one million, three hundred seventy-five thousand, two hundred sixty-eight".