21041331023 has 4 divisors (see below), whose sum is σ = 21080224968. Its totient is φ = 21002437080.

The previous prime is 21041331007. The next prime is 21041331029. The reversal of 21041331023 is 32013314012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21041331023 - 2⁴ = 21041331007 is a prime.

It is a super-2 number, since 2×21041331023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21041330986 and 21041331004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041331029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19446161 + ... + 19447242.

It is an arithmetic number, because the mean of its divisors is an integer number (5270056242).

Almost surely, 2^21041331023 is an apocalyptic number.

21041331023 is a deficient number, since it is larger than the sum of its proper divisors (38893945).

21041331023 is an equidigital number, since it uses as much as digits as its factorization.

21041331023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38893944.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21041331023 its reverse (32013314012), we get a palindrome (53054645035).

The spelling of 21041331023 in words is "twenty-one billion, forty-one million, three hundred thirty-one thousand, twenty-three".