21120312031120 has 20 divisors (see below), whose sum is σ = 49104725472540. Its totient is φ = 8448124812416.

The previous prime is 21120312031097. The next prime is 21120312031129. The reversal of 21120312031120 is 2113021302112.

It can be written as a sum of positive squares in 2 ways, for example, as 15412188298896 + 5708123732224 = 3925836^2 + 2389168^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (21120312031129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132001950115 + ... + 132001950274.

It is an arithmetic number, because the mean of its divisors is an integer number (2455236273627).

Almost surely, 2^{21120312031120} is an apocalyptic number.

21120312031120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120312031120 is an abundant number, since it is smaller than the sum of its proper divisors (27984413441420).

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

21120312031120 is a wasteful number, since it uses less digits than its factorization.

21120312031120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264003900402 (or 264003900396 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21120312031120 its reverse (2113021302112), we get a palindrome (23233333333232).

The spelling of 21120312031120 in words is "twenty-one trillion, one hundred twenty billion, three hundred twelve million, thirty-one thousand, one hundred twenty".