21110000013 has 12 divisors (see below), whose sum is σ = 30524776828. Its totient is φ = 14058308160.

The previous prime is 21110000003. The next prime is 21110000057. The reversal of 21110000013 is 31000001112.

It can be written as a sum of positive squares in 2 ways, for example, as 6526539369 + 14583460644 = 80787^2 + 120762^2 .

It is not a de Polignac number, because 21110000013 - 2⁶ = 21109999949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110000003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1243198 + ... + 1260063.

Almost surely, 2^21110000013 is an apocalyptic number.

It is an amenable number.

21110000013 is a deficient number, since it is larger than the sum of its proper divisors (9414776815).

21110000013 is a wasteful number, since it uses less digits than its factorization.

21110000013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504204 (or 2504201 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 21110000013 its reverse (31000001112), we get a palindrome (52110001125).

The spelling of 21110000013 in words is "twenty-one billion, one hundred ten million, thirteen", and thus it is an aban number.