21041031 has 8 divisors (see below), whose sum is σ = 30605184. Its totient is φ = 12752120.

The previous prime is 21041029. The next prime is 21041047. The reversal of 21041031 is 13014012.

It is a happy number.

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 21041031 - 2¹ = 21041029 is a prime.

It is a super-2 number, since 2×21041031² = 885449971085922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21040998 and 21041016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041011) 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, 318771 + ... + 318836.

It is an arithmetic number, because the mean of its divisors is an integer number (3825648).

Almost surely, 2^21041031 is an apocalyptic number.

21041031 is a deficient number, since it is larger than the sum of its proper divisors (9564153).

21041031 is a wasteful number, since it uses less digits than its factorization.

21041031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637621.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21041031 is about 4587.0503594358. The cubic root of 21041031 is about 276.0719855291.

Adding to 21041031 its reverse (13014012), we get a palindrome (34055043).

The spelling of 21041031 in words is "twenty-one million, forty-one thousand, thirty-one".