21012101113 has 4 divisors (see below), whose sum is σ = 21368238480. Its totient is φ = 20655963748.

The previous prime is 21012101093. The next prime is 21012101251. The reversal of 21012101113 is 31110121012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21012101113 - 2²⁵ = 20978546681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012101093 and 21012101102.

It is not an unprimeable number, because it can be changed into a prime (21012161113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178068595 + ... + 178068712.

It is an arithmetic number, because the mean of its divisors is an integer number (5342059620).

Almost surely, 2^21012101113 is an apocalyptic number.

It is an amenable number.

21012101113 is a deficient number, since it is larger than the sum of its proper divisors (356137367).

21012101113 is an equidigital number, since it uses as much as digits as its factorization.

21012101113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356137366.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21012101113 its reverse (31110121012), we get a palindrome (52122222125).

The spelling of 21012101113 in words is "twenty-one billion, twelve million, one hundred one thousand, one hundred thirteen".