21041279 has 8 divisors (see below), whose sum is σ = 24441888. Its totient is φ = 17739360.

The previous prime is 21041263. The next prime is 21041299. The reversal of 21041279 is 97214012.

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 21041279 - 2⁴ = 21041263 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 (21041239) 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, 24212 + ... + 25065.

It is an arithmetic number, because the mean of its divisors is an integer number (3055236).

Almost surely, 2^21041279 is an apocalyptic number.

21041279 is a deficient number, since it is larger than the sum of its proper divisors (3400609).

21041279 is an equidigital number, since it uses as much as digits as its factorization.

21041279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49345.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 21041279 is about 4587.0773919785. The cubic root of 21041279 is about 276.0730701652.

The spelling of 21041279 in words is "twenty-one million, forty-one thousand, two hundred seventy-nine".