21375075 has 24 divisors (see below), whose sum is σ = 35696128. Its totient is φ = 11285280.

The previous prime is 21375061. The next prime is 21375097. The reversal of 21375075 is 57057312.

It is not a de Polignac number, because 21375075 - 2⁵ = 21375043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6342 + ... + 9108.

Almost surely, 2^21375075 is an apocalyptic number.

21375075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21375075 is a deficient number, since it is larger than the sum of its proper divisors (14321053).

21375075 is a wasteful number, since it uses less digits than its factorization.

21375075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 21375075 is about 4623.3186132907. The cubic root of 21375075 is about 277.5252797358.

The spelling of 21375075 in words is "twenty-one million, three hundred seventy-five thousand, seventy-five".