21112102013 has 8 divisors (see below), whose sum is σ = 21670665816. Its totient is φ = 20560392000.

The previous prime is 21112102007. The next prime is 21112102027. The reversal of 21112102013 is 31020121112.

It can be written as a sum of positive squares in 4 ways, for example, as 7021937209 + 14090164804 = 83797^2 + 118702^2 .

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 21112102013 - 2⁶ = 21112101949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112102213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707206 + ... + 1719527.

It is an arithmetic number, because the mean of its divisors is an integer number (2708833227).

Almost surely, 2^21112102013 is an apocalyptic number.

It is an amenable number.

21112102013 is a deficient number, since it is larger than the sum of its proper divisors (558563803).

21112102013 is a wasteful number, since it uses less digits than its factorization.

21112102013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426895.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21112102013 its reverse (31020121112), we get a palindrome (52132223125).

The spelling of 21112102013 in words is "twenty-one billion, one hundred twelve million, one hundred two thousand, thirteen".