21103312122 has 48 divisors (see below), whose sum is σ = 49790052000. Its totient is φ = 6434400672.

The previous prime is 21103312081. The next prime is 21103312123. The reversal of 21103312122 is 22121330112.

21103312122 is a `hidden beast` number, since 211 + 0 + 331 + 2 + 122 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21103312095 and 21103312104.

It is not an unprimeable number, because it can be changed into a prime (21103312123) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1053972 + ... + 1073807.

It is an arithmetic number, because the mean of its divisors is an integer number (1037292750).

Almost surely, 2^21103312122 is an apocalyptic number.

21103312122 is an abundant number, since it is smaller than the sum of its proper divisors (28686739878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103312122 is a wasteful number, since it uses less digits than its factorization.

21103312122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127835 (or 2127832 counting only the distinct ones).

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

Adding to 21103312122 its reverse (22121330112), we get a palindrome (43224642234).

The spelling of 21103312122 in words is "twenty-one billion, one hundred three million, three hundred twelve thousand, one hundred twenty-two".