21122103312 has 60 divisors (see below), whose sum is σ = 62223748080. Its totient is φ = 6670137024.

The previous prime is 21122103269. The next prime is 21122103319. The reversal of 21122103312 is 21330122112.

It is a super-2 number, since 2×21122103312² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21122103319) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3857298 + ... + 3862769.

It is an arithmetic number, because the mean of its divisors is an integer number (1037062468).

Almost surely, 2^21122103312 is an apocalyptic number.

It is an amenable number.

21122103312 is an abundant number, since it is smaller than the sum of its proper divisors (41101644768).

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

21122103312 is a wasteful number, since it uses less digits than its factorization.

21122103312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720100 (or 7720091 counting only the distinct ones).

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

Adding to 21122103312 its reverse (21330122112), we get a palindrome (42452225424).

The spelling of 21122103312 in words is "twenty-one billion, one hundred twenty-two million, one hundred three thousand, three hundred twelve".