21531535114042 has 8 divisors (see below), whose sum is σ = 32367361897332. Its totient is φ = 10742414481600.

The previous prime is 21531535114027. The next prime is 21531535114043. The reversal of 21531535114042 is 24041153513512.

It can be written as a sum of positive squares in 2 ways, for example, as 21528477134641 + 3057979401 = 4639879^2 + 55299^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21531535113992 and 21531535114010.

It is not an unprimeable number, because it can be changed into a prime (21531535114043) 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 3 ways as a sum of consecutive naturals, for example, 11676536559 + ... + 11676538402.

Almost surely, 2^{21531535114042} is an apocalyptic number.

21531535114042 is a deficient number, since it is larger than the sum of its proper divisors (10835826783290).

21531535114042 is a wasteful number, since it uses less digits than its factorization.

21531535114042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23353075424.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 21531535114042 its reverse (24041153513512), we get a palindrome (45572688627554).

The spelling of 21531535114042 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred thirty-five million, one hundred fourteen thousand, forty-two".