21111322013 has 8 divisors (see below), whose sum is σ = 21702662016. Its totient is φ = 20523621600.

The previous prime is 21111321911. The next prime is 21111322039. The reversal of 21111322013 is 31022311112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21111322013 - 2⁸ = 21111321757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111321982 and 21111322000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111322073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 898133 + ... + 921338.

It is an arithmetic number, because the mean of its divisors is an integer number (2712832752).

Almost surely, 2^21111322013 is an apocalyptic number.

It is an amenable number.

21111322013 is a deficient number, since it is larger than the sum of its proper divisors (591340003).

21111322013 is a wasteful number, since it uses less digits than its factorization.

21111322013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819795.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21111322013 its reverse (31022311112), we get a palindrome (52133633125).

The spelling of 21111322013 in words is "twenty-one billion, one hundred eleven million, three hundred twenty-two thousand, thirteen".