21112122005 has 32 divisors (see below), whose sum is σ = 27980709120. Its totient is φ = 15192875520.

The previous prime is 21112121999. The next prime is 21112122079. The reversal of 21112122005 is 50022121112.

It is not a de Polignac number, because 21112122005 - 2⁶ = 21112121941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2615666 + ... + 2623724.

It is an arithmetic number, because the mean of its divisors is an integer number (874397160).

Almost surely, 2^21112122005 is an apocalyptic number.

It is an amenable number.

21112122005 is a deficient number, since it is larger than the sum of its proper divisors (6868587115).

21112122005 is a wasteful number, since it uses less digits than its factorization.

21112122005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9101.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21112122005 its reverse (50022121112), we get a palindrome (71134243117).

The spelling of 21112122005 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, five".