21031113041 has 4 divisors (see below), whose sum is σ = 21034278000. Its totient is φ = 21027948084.

The previous prime is 21031113023. The next prime is 21031113073. The reversal of 21031113041 is 14031113012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21031113041 - 2²⁶ = 20964004177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21031113001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1572491 + ... + 1585808.

It is an arithmetic number, because the mean of its divisors is an integer number (5258569500).

Almost surely, 2^21031113041 is an apocalyptic number.

It is an amenable number.

21031113041 is a deficient number, since it is larger than the sum of its proper divisors (3164959).

21031113041 is an equidigital number, since it uses as much as digits as its factorization.

21031113041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164958.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21031113041 its reverse (14031113012), we get a palindrome (35062226053).

The spelling of 21031113041 in words is "twenty-one billion, thirty-one million, one hundred thirteen thousand, forty-one".