21131431233513 has 8 divisors (see below), whose sum is σ = 28862442660576. Its totient is φ = 13744020314400.

The previous prime is 21131431233511. The next prime is 21131431233659. The reversal of 21131431233513 is 31533213413112.

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

It is not a de Polignac number, because 21131431233513 - 2¹ = 21131431233511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21131431233511) 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, 85900126843 + ... + 85900127088.

It is an arithmetic number, because the mean of its divisors is an integer number (3607805332572).

Almost surely, 2^{21131431233513} is an apocalyptic number.

It is an amenable number.

21131431233513 is a deficient number, since it is larger than the sum of its proper divisors (7731011427063).

21131431233513 is a wasteful number, since it uses less digits than its factorization.

21131431233513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171800253975.

The product of its digits is 19440, while the sum is 33.

Adding to 21131431233513 its reverse (31533213413112), we get a palindrome (52664644646625).

The spelling of 21131431233513 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred thirty-one million, two hundred thirty-three thousand, five hundred thirteen".