21531431143323 has 12 divisors (see below), whose sum is σ = 31113855735768. Its totient is φ = 14348333748960.

The previous prime is 21531431143297. The next prime is 21531431143429. The reversal of 21531431143323 is 32334113413512.

21531431143323 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 1 + 4 + 311 + 4 + 332 + 3 = 666.

It is not a de Polignac number, because 21531431143323 - 2⁵ = 21531431143291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21531431143823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496117090 + ... + 496160487.

It is an arithmetic number, because the mean of its divisors is an integer number (2592821311314).

Almost surely, 2^{21531431143323} is an apocalyptic number.

21531431143323 is a deficient number, since it is larger than the sum of its proper divisors (9582424592445).

21531431143323 is a wasteful number, since it uses less digits than its factorization.

21531431143323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992279994 (or 992279991 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

Adding to 21531431143323 its reverse (32334113413512), we get a palindrome (53865544556835).

The spelling of 21531431143323 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty-one million, one hundred forty-three thousand, three hundred twenty-three".