21075607 has 8 divisors (see below), whose sum is σ = 24737696. Its totient is φ = 17576352.

The previous prime is 21075601. The next prime is 21075623. The reversal of 21075607 is 70657012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21075607 - 2¹⁵ = 21042839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40428 + ... + 40945.

It is an arithmetic number, because the mean of its divisors is an integer number (3092212).

Almost surely, 2^21075607 is an apocalyptic number.

21075607 is a deficient number, since it is larger than the sum of its proper divisors (3662089).

21075607 is an equidigital number, since it uses as much as digits as its factorization.

21075607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81417.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 21075607 is about 4590.8176831584. The cubic root of 21075607 is about 276.2231226282.

The spelling of 21075607 in words is "twenty-one million, seventy-five thousand, six hundred seven".