21113431243131 has 8 divisors (see below), whose sum is σ = 28153144213264. Its totient is φ = 14074669550880.

The previous prime is 21113431243129. The next prime is 21113431243141. The reversal of 21113431243131 is 13134213431112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21113431243131 - 2¹ = 21113431243129 is a prime.

It is a super-2 number, since 2×21113431243131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113431243141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237767680 + ... + 237856461.

It is an arithmetic number, because the mean of its divisors is an integer number (3519143026658).

Almost surely, 2^{21113431243131} is an apocalyptic number.

21113431243131 is a deficient number, since it is larger than the sum of its proper divisors (7039712970133).

21113431243131 is a wasteful number, since it uses less digits than its factorization.

21113431243131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475638941.

The product of its digits is 5184, while the sum is 30.

Adding to 21113431243131 its reverse (13134213431112), we get a palindrome (34247644674243).

The spelling of 21113431243131 in words is "twenty-one trillion, one hundred thirteen billion, four hundred thirty-one million, two hundred forty-three thousand, one hundred thirty-one".