21022123113 has 12 divisors (see below), whose sum is σ = 31412368260. Its totient is φ = 13531481376.

The previous prime is 21022123103. The next prime is 21022123139. The reversal of 21022123113 is 31132122012.

21022123113 is a `hidden beast` number, since 210 + 221 + 231 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11611571049 + 9410552064 = 107757^2 + 97008^2 .

It is not a de Polignac number, because 21022123113 - 2⁶ = 21022123049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022123103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40272006 + ... + 40272527.

It is an arithmetic number, because the mean of its divisors is an integer number (2617697355).

Almost surely, 2^21022123113 is an apocalyptic number.

It is an amenable number.

21022123113 is a deficient number, since it is larger than the sum of its proper divisors (10390245147).

21022123113 is a wasteful number, since it uses less digits than its factorization.

21022123113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80544568 (or 80544565 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21022123113 its reverse (31132122012), we get a palindrome (52154245125).

The spelling of 21022123113 in words is "twenty-one billion, twenty-two million, one hundred twenty-three thousand, one hundred thirteen".