21312331235 has 16 divisors (see below), whose sum is σ = 27826036896. Its totient is φ = 15576081408.

The previous prime is 21312331223. The next prime is 21312331241. The reversal of 21312331235 is 53213321312.

It is a cyclic number.

It is not a de Polignac number, because 21312331235 - 2⁶ = 21312331171 is a prime.

It is a Duffinian 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, 1683809 + ... + 1696418.

It is an arithmetic number, because the mean of its divisors is an integer number (1739127306).

Almost surely, 2^21312331235 is an apocalyptic number.

21312331235 is a deficient number, since it is larger than the sum of its proper divisors (6513705661).

21312331235 is a wasteful number, since it uses less digits than its factorization.

21312331235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380342.

The product of its digits is 3240, while the sum is 26.

Adding to 21312331235 its reverse (53213321312), we get a palindrome (74525652547).

The spelling of 21312331235 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-one thousand, two hundred thirty-five".