21079635 has 8 divisors (see below), whose sum is σ = 33727440. Its totient is φ = 11242464.

The previous prime is 21079631. The next prime is 21079651. The reversal of 21079635 is 53697012.

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

It is not a de Polignac number, because 21079635 - 2² = 21079631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21079596 and 21079605.

It is not an unprimeable number, because it can be changed into a prime (21079631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702640 + ... + 702669.

It is an arithmetic number, because the mean of its divisors is an integer number (4215930).

Almost surely, 2^21079635 is an apocalyptic number.

21079635 is a deficient number, since it is larger than the sum of its proper divisors (12647805).

21079635 is a wasteful number, since it uses less digits than its factorization.

21079635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405317.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 21079635 is about 4591.2563640032. The cubic root of 21079635 is about 276.2407188927.

The spelling of 21079635 in words is "twenty-one million, seventy-nine thousand, six hundred thirty-five".