21112321313 has 16 divisors (see below), whose sum is σ = 22184143872. Its totient is φ = 20067264000.

The previous prime is 21112321273. The next prime is 21112321361. The reversal of 21112321313 is 31312321112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21112321313 - 2⁸ = 21112321057 is a prime.

It is a super-2 number, since 2×21112321313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112321393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526028 + ... + 564738.

It is an arithmetic number, because the mean of its divisors is an integer number (1386508992).

Almost surely, 2^21112321313 is an apocalyptic number.

It is an amenable number.

21112321313 is a deficient number, since it is larger than the sum of its proper divisors (1071822559).

21112321313 is a wasteful number, since it uses less digits than its factorization.

21112321313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39056.

The product of its digits is 216, while the sum is 20.

Adding to 21112321313 its reverse (31312321112), we get a palindrome (52424642425).

The spelling of 21112321313 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-one thousand, three hundred thirteen".