21112022005 has 4 divisors (see below), whose sum is σ = 25334426412. Its totient is φ = 16889617600.

The previous prime is 21112021943. The next prime is 21112022053. The reversal of 21112022005 is 50022021112.

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 11151782404 + 9960239601 = 105602^2 + 99801^2 .

It is not a de Polignac number, because 21112022005 - 2²¹ = 21109924853 is a prime.

It is a super-4 number, since 4×21112022005⁴ (a number of 42 digits) contains 4444 as substring.

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 21112022005.

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, 2111202196 + ... + 2111202205.

It is an arithmetic number, because the mean of its divisors is an integer number (6333606603).

Almost surely, 2^21112022005 is an apocalyptic number.

It is an amenable number.

21112022005 is a deficient number, since it is larger than the sum of its proper divisors (4222404407).

21112022005 is an equidigital number, since it uses as much as digits as its factorization.

21112022005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222404406.

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

Adding to 21112022005 its reverse (50022021112), we get a palindrome (71134043117).

The spelling of 21112022005 in words is "twenty-one billion, one hundred twelve million, twenty-two thousand, five".