21110130031 has 4 divisors (see below), whose sum is σ = 21220654464. Its totient is φ = 20999605600.

The previous prime is 21110130023. The next prime is 21110130037. The reversal of 21110130031 is 13003101112.

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 21110130031 - 2³ = 21110130023 is a prime.

It is a super-2 number, since 2×21110130031² (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 = 21110129993 and 21110130020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110130037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55261930 + ... + 55262311.

It is an arithmetic number, because the mean of its divisors is an integer number (5305163616).

Almost surely, 2^21110130031 is an apocalyptic number.

21110130031 is a deficient number, since it is larger than the sum of its proper divisors (110524433).

21110130031 is a wasteful number, since it uses less digits than its factorization.

21110130031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110524432.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21110130031 its reverse (13003101112), we get a palindrome (34113231143).

The spelling of 21110130031 in words is "twenty-one billion, one hundred ten million, one hundred thirty thousand, thirty-one".