21031431000135 has 16 divisors (see below), whose sum is σ = 33656529353184. Its totient is φ = 11214683282432.

The previous prime is 21031431000101. The next prime is 21031431000157. The reversal of 21031431000135 is 53100013413012.

It is a cyclic number.

It is not a de Polignac number, because 21031431000135 - 2⁶ = 21031431000071 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129911262 + ... + 130073051.

It is an arithmetic number, because the mean of its divisors is an integer number (2103533084574).

Almost surely, 2^{21031431000135} is an apocalyptic number.

21031431000135 is a deficient number, since it is larger than the sum of its proper divisors (12625098353049).

21031431000135 is a wasteful number, since it uses less digits than its factorization.

21031431000135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259989714.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21031431000135 its reverse (53100013413012), we get a palindrome (74131444413147).

The spelling of 21031431000135 in words is "twenty-one trillion, thirty-one billion, four hundred thirty-one million, one hundred thirty-five", and thus it is an aban number.