11203120031 has 4 divisors (see below), whose sum is σ = 11225130600. Its totient is φ = 11181109464.

The previous prime is 11203120001. The next prime is 11203120057. The reversal of 11203120031 is 13002130211.

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 11203120031 - 2²⁶ = 11136011167 is a prime.

It is a super-2 number, since 2×11203120031² (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 = 11203119988 and 11203120015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11203120001) 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, 11004521 + ... + 11005538.

It is an arithmetic number, because the mean of its divisors is an integer number (2806282650).

Almost surely, 2^11203120031 is an apocalyptic number.

11203120031 is a deficient number, since it is larger than the sum of its proper divisors (22010569).

11203120031 is an equidigital number, since it uses as much as digits as its factorization.

11203120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22010568.

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

Adding to 11203120031 its reverse (13002130211), we get a palindrome (24205250242).

The spelling of 11203120031 in words is "eleven billion, two hundred three million, one hundred twenty thousand, thirty-one".