21313231024 has 20 divisors (see below), whose sum is σ = 43723467144. Its totient is φ = 10029755648.

The previous prime is 21313231003. The next prime is 21313231067. The reversal of 21313231024 is 42013231312.

It is a junction number, because it is equal to n+sod(n) for n = 21313230986 and 21313231004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39178462 + ... + 39179005.

Almost surely, 2^21313231024 is an apocalyptic number.

It is an amenable number.

21313231024 is an abundant number, since it is smaller than the sum of its proper divisors (22410236120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21313231024 is a wasteful number, since it uses less digits than its factorization.

21313231024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78357492 (or 78357486 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21313231024 its reverse (42013231312), we get a palindrome (63326462336).

The spelling of 21313231024 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-one thousand, twenty-four".