11821403131 has 4 divisors (see below), whose sum is σ = 11926017432. Its totient is φ = 11716788832.

The previous prime is 11821403123. The next prime is 11821403137. The reversal of 11821403131 is 13130412811.

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 11821403131 - 2³ = 11821403123 is a prime.

It is a super-2 number, since 2×11821403131² (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 = 11821403096 and 11821403105.

It is not an unprimeable number, because it can be changed into a prime (11821403137) 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, 52306981 + ... + 52307206.

It is an arithmetic number, because the mean of its divisors is an integer number (2981504358).

Almost surely, 2^11821403131 is an apocalyptic number.

11821403131 is a deficient number, since it is larger than the sum of its proper divisors (104614301).

11821403131 is a wasteful number, since it uses less digits than its factorization.

11821403131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104614300.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 11821403131 its reverse (13130412811), we get a palindrome (24951815942).

The spelling of 11821403131 in words is "eleven billion, eight hundred twenty-one million, four hundred three thousand, one hundred thirty-one".