11131431021 has 16 divisors (see below), whose sum is σ = 17059665600. Its totient is φ = 7165058544.

The previous prime is 11131431011. The next prime is 11131431043. The reversal of 11131431021 is 12013413111.

It is a happy number.

It is not a de Polignac number, because 11131431021 - 2¹⁸ = 11131168877 is a prime.

It is a super-2 number, since 2×11131431021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11131430985 and 11131431003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131431011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7107411 + ... + 7108976.

It is an arithmetic number, because the mean of its divisors is an integer number (1066229100).

Almost surely, 2^11131431021 is an apocalyptic number.

It is an amenable number.

11131431021 is a deficient number, since it is larger than the sum of its proper divisors (5928234579).

11131431021 is a wasteful number, since it uses less digits than its factorization.

11131431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14216425 (or 14216419 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 11131431021 its reverse (12013413111), we get a palindrome (23144844132).

The spelling of 11131431021 in words is "eleven billion, one hundred thirty-one million, four hundred thirty-one thousand, twenty-one".