21200112013 has 4 divisors (see below), whose sum is σ = 21228800320. Its totient is φ = 21171423708.

The previous prime is 21200112007. The next prime is 21200112067. The reversal of 21200112013 is 31021100212.

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 a de Polignac number, because none of the positive numbers 2^k-21200112013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200111984 and 21200112002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200112613) 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, 14343045 + ... + 14344522.

It is an arithmetic number, because the mean of its divisors is an integer number (5307200080).

Almost surely, 2^21200112013 is an apocalyptic number.

It is an amenable number.

21200112013 is a deficient number, since it is larger than the sum of its proper divisors (28688307).

21200112013 is an equidigital number, since it uses as much as digits as its factorization.

21200112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28688306.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21200112013 its reverse (31021100212), we get a palindrome (52221212225).

The spelling of 21200112013 in words is "twenty-one billion, two hundred million, one hundred twelve thousand, thirteen".