21202000112005 has 4 divisors (see below), whose sum is σ = 25442400134412. Its totient is φ = 16961600089600.

The previous prime is 21202000111979. The next prime is 21202000112011. The reversal of 21202000112005 is 50021100020212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13959534172516 + 7242465939489 = 3736246^2 + 2691183^2 .

It is not a de Polignac number, because 21202000112005 - 2²⁷ = 21201865894277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202000112005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2120200011196 + ... + 2120200011205.

It is an arithmetic number, because the mean of its divisors is an integer number (6360600033603).

Almost surely, 2^{21202000112005} is an apocalyptic number.

It is an amenable number.

21202000112005 is a deficient number, since it is larger than the sum of its proper divisors (4240400022407).

21202000112005 is an equidigital number, since it uses as much as digits as its factorization.

21202000112005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240400022406.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21202000112005 its reverse (50021100020212), we get a palindrome (71223100132217).

The spelling of 21202000112005 in words is "twenty-one trillion, two hundred two billion, one hundred twelve thousand, five".