21231441031 has 4 divisors (see below), whose sum is σ = 21632034312. Its totient is φ = 20830847752.

The previous prime is 21231441017. The next prime is 21231441061. The reversal of 21231441031 is 13014413212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21231441031 is a prime.

It is a super-2 number, since 2×21231441031² (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 = 21231440993 and 21231441011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231441061) 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, 200296561 + ... + 200296666.

It is an arithmetic number, because the mean of its divisors is an integer number (5408008578).

Almost surely, 2^21231441031 is an apocalyptic number.

21231441031 is a deficient number, since it is larger than the sum of its proper divisors (400593281).

21231441031 is an equidigital number, since it uses as much as digits as its factorization.

21231441031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400593280.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21231441031 its reverse (13014413212), we get a palindrome (34245854243).

The spelling of 21231441031 in words is "twenty-one billion, two hundred thirty-one million, four hundred forty-one thousand, thirty-one".