21275607 has 8 divisors (see below), whose sum is σ = 28413040. Its totient is φ = 14160960.

The previous prime is 21275599. The next prime is 21275623. The reversal of 21275607 is 70657212.

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

It is not a de Polignac number, because 21275607 - 2³ = 21275599 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 (21275677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3382 + ... + 7347.

It is an arithmetic number, because the mean of its divisors is an integer number (3551630).

Almost surely, 2^21275607 is an apocalyptic number.

21275607 is a deficient number, since it is larger than the sum of its proper divisors (7137433).

21275607 is a wasteful number, since it uses less digits than its factorization.

21275607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11393.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 21275607 is about 4612.5488615298. The cubic root of 21275607 is about 277.0941262396.

The spelling of 21275607 in words is "twenty-one million, two hundred seventy-five thousand, six hundred seven".