21375016 has 16 divisors (see below), whose sum is σ = 43161300. Its totient is φ = 9865344.

The previous prime is 21375007. The next prime is 21375023. The reversal of 21375016 is 61057312.

It can be written as a sum of positive squares in 2 ways, for example, as 21068100 + 306916 = 4590^2 + 554^2 .

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, 102661 + ... + 102868.

Almost surely, 2^21375016 is an apocalyptic number.

21375016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21375016 is an abundant number, since it is smaller than the sum of its proper divisors (21786284).

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

21375016 is a wasteful number, since it uses less digits than its factorization.

21375016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205548 (or 205544 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21375016 is about 4623.3122325882. The cubic root of 21375016 is about 277.5250243916.

The spelling of 21375016 in words is "twenty-one million, three hundred seventy-five thousand, sixteen".