21131431231042 has 8 divisors (see below), whose sum is σ = 34578705650832. Its totient is φ = 9605196014100.

The previous prime is 21131431231013. The next prime is 21131431231067. The reversal of 21131431231042 is 24013213413112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21131431231042.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480259800684 + ... + 480259800727.

It is an arithmetic number, because the mean of its divisors is an integer number (4322338206354).

Almost surely, 2^{21131431231042} is an apocalyptic number.

21131431231042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21131431231042 is a deficient number, since it is larger than the sum of its proper divisors (13447274419790).

21131431231042 is a wasteful number, since it uses less digits than its factorization.

21131431231042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960519601424.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21131431231042 its reverse (24013213413112), we get a palindrome (45144644644154).

The spelling of 21131431231042 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred thirty-one million, two hundred thirty-one thousand, forty-two".