21298875 has 64 divisors (see below), whose sum is σ = 40569984. Its totient is φ = 9830400.

The previous prime is 21298873. The next prime is 21298877. The reversal of 21298875 is 57889212.

It is an interprime number because it is at equal distance from previous prime (21298873) and next prime (21298877).

It is not a de Polignac number, because 21298875 - 2¹ = 21298873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21298873) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 82747 + ... + 83003.

It is an arithmetic number, because the mean of its divisors is an integer number (633906).

Almost surely, 2^21298875 is an apocalyptic number.

21298875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21298875 is a deficient number, since it is larger than the sum of its proper divisors (19271109).

21298875 is a wasteful number, since it uses less digits than its factorization.

21298875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 295 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 21298875 is about 4615.0704219979. The cubic root of 21298875 is about 277.1951038075.

The spelling of 21298875 in words is "twenty-one million, two hundred ninety-eight thousand, eight hundred seventy-five".