21041331 has 8 divisors (see below), whose sum is σ = 28086720. Its totient is φ = 14011752.

The previous prime is 21041309. The next prime is 21041353. The reversal of 21041331 is 13314012.

It is an interprime number because it is at equal distance from previous prime (21041309) and next prime (21041353).

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

It is not a de Polignac number, because 21041331 - 2⁵ = 21041299 is a prime.

It is a super-2 number, since 2×21041331² = 885475220503122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21041331.

It is not an unprimeable number, because it can be changed into a prime (21041381) 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, 385 + ... + 6498.

It is an arithmetic number, because the mean of its divisors is an integer number (3510840).

Almost surely, 2^21041331 is an apocalyptic number.

21041331 is a deficient number, since it is larger than the sum of its proper divisors (7045389).

21041331 is a wasteful number, since it uses less digits than its factorization.

21041331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21041331 is about 4587.0830600721. The cubic root of 21041331 is about 276.0732975878.

Adding to 21041331 its reverse (13314012), we get a palindrome (34355343).

The spelling of 21041331 in words is "twenty-one million, forty-one thousand, three hundred thirty-one".