21110403031 has 2 divisors, whose sum is σ = 21110403032. Its totient is φ = 21110403030.

The previous prime is 21110403029. The next prime is 21110403043. The reversal of 21110403031 is 13030401112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21110403031 - 2¹ = 21110403029 is a prime.

It is a super-2 number, since 2×21110403031² (a number of 21 digits) contains 22 as substring.

Together with 21110403029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21110402996 and 21110403014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110403011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555201515 + 10555201516.

It is an arithmetic number, because the mean of its divisors is an integer number (10555201516).

Almost surely, 2^21110403031 is an apocalyptic number.

21110403031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110403031 is an equidigital number, since it uses as much as digits as its factorization.

21110403031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21110403031 its reverse (13030401112), we get a palindrome (34140804143).

The spelling of 21110403031 in words is "twenty-one billion, one hundred ten million, four hundred three thousand, thirty-one".