20121103031 has 4 divisors (see below), whose sum is σ = 20814934200. Its totient is φ = 19427271864.

The previous prime is 20121103021. The next prime is 20121103039. The reversal of 20121103031 is 13030112102.

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 20121103031 - 2¹⁰ = 20121102007 is a prime.

It is a super-2 number, since 2×20121103031² (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 = 20121102997 and 20121103015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121103039) 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, 346915541 + ... + 346915598.

It is an arithmetic number, because the mean of its divisors is an integer number (5203733550).

Almost surely, 2^20121103031 is an apocalyptic number.

20121103031 is a deficient number, since it is larger than the sum of its proper divisors (693831169).

20121103031 is an equidigital number, since it uses as much as digits as its factorization.

20121103031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693831168.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20121103031 its reverse (13030112102), we get a palindrome (33151215133).

The spelling of 20121103031 in words is "twenty billion, one hundred twenty-one million, one hundred three thousand, thirty-one".