21101323013 has 4 divisors (see below), whose sum is σ = 21338416620. Its totient is φ = 20864229408.

The previous prime is 21101322997. The next prime is 21101323027. The reversal of 21101323013 is 31032310112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12201853444 + 8899469569 = 110462^2 + 94337^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101323013 - 2⁴ = 21101322997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101322982 and 21101323000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101323213) by changing a digit.

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, 118546670 + ... + 118546847.

It is an arithmetic number, because the mean of its divisors is an integer number (5334604155).

Almost surely, 2^21101323013 is an apocalyptic number.

It is an amenable number.

21101323013 is a deficient number, since it is larger than the sum of its proper divisors (237093607).

21101323013 is an equidigital number, since it uses as much as digits as its factorization.

21101323013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237093606.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21101323013 its reverse (31032310112), we get a palindrome (52133633125).

The spelling of 21101323013 in words is "twenty-one billion, one hundred one million, three hundred twenty-three thousand, thirteen".