21231045535 has 32 divisors (see below), whose sum is σ = 29809866240. Its totient is φ = 14212291968.

The previous prime is 21231045533. The next prime is 21231045541. The reversal of 21231045535 is 53554013212.

It is not a de Polignac number, because 21231045535 - 2¹ = 21231045533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231045497 and 21231045506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231045533) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 5616276 + ... + 5620054.

It is an arithmetic number, because the mean of its divisors is an integer number (931558320).

Almost surely, 2^21231045535 is an apocalyptic number.

21231045535 is a deficient number, since it is larger than the sum of its proper divisors (8578820705).

21231045535 is a wasteful number, since it uses less digits than its factorization.

21231045535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7567.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 21231045535 its reverse (53554013212), we get a palindrome (74785058747).

The spelling of 21231045535 in words is "twenty-one billion, two hundred thirty-one million, forty-five thousand, five hundred thirty-five".