21313352481 has 32 divisors (see below), whose sum is σ = 29923084800. Its totient is φ = 13474433280.

The previous prime is 21313352453. The next prime is 21313352491. The reversal of 21313352481 is 18425331312.

It is not a de Polignac number, because 21313352481 - 2²⁶ = 21246243617 is a prime.

It is a super-4 number, since 4×21313352481⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21313352491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4227160 + ... + 4232198.

It is an arithmetic number, because the mean of its divisors is an integer number (935096400).

Almost surely, 2^21313352481 is an apocalyptic number.

It is an amenable number.

21313352481 is a deficient number, since it is larger than the sum of its proper divisors (8609732319).

21313352481 is a wasteful number, since it uses less digits than its factorization.

21313352481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929.

The product of its digits is 17280, while the sum is 33.

Adding to 21313352481 its reverse (18425331312), we get a palindrome (39738683793).

The spelling of 21313352481 in words is "twenty-one billion, three hundred thirteen million, three hundred fifty-two thousand, four hundred eighty-one".