21312348524 has 6 divisors (see below), whose sum is σ = 37296609924. Its totient is φ = 10656174260.

The previous prime is 21312348511. The next prime is 21312348529. The reversal of 21312348524 is 42584321312.

It is not an unprimeable number, because it can be changed into a prime (21312348529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2664043562 + ... + 2664043569.

It is an arithmetic number, because the mean of its divisors is an integer number (6216101654).

Almost surely, 2^21312348524 is an apocalyptic number.

It is an amenable number.

21312348524 is a deficient number, since it is larger than the sum of its proper divisors (15984261400).

21312348524 is a wasteful number, since it uses less digits than its factorization.

21312348524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328087135 (or 5328087133 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

Adding to 21312348524 its reverse (42584321312), we get a palindrome (63896669836).

The spelling of 21312348524 in words is "twenty-one billion, three hundred twelve million, three hundred forty-eight thousand, five hundred twenty-four".