21294075 has 48 divisors (see below), whose sum is σ = 39211776. Its totient is φ = 10108800.

The previous prime is 21294029. The next prime is 21294089. The reversal of 21294075 is 57049212.

It is not a de Polignac number, because 21294075 - 2⁷ = 21293947 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43482 + ... + 43968.

It is an arithmetic number, because the mean of its divisors is an integer number (816912).

Almost surely, 2^21294075 is an apocalyptic number.

21294075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21294075 is a deficient number, since it is larger than the sum of its proper divisors (17917701).

21294075 is a wasteful number, since it uses less digits than its factorization.

21294075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 559 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21294075 is about 4614.5503572938. The cubic root of 21294075 is about 277.1742789758.

The spelling of 21294075 in words is "twenty-one million, two hundred ninety-four thousand, seventy-five".