21102220121120 has 48 divisors (see below), whose sum is σ = 49856352334488. Its totient is φ = 8440488929280.

The previous prime is 21102220121093. The next prime is 21102220121137. The reversal of 21102220121120 is 2112102220112.

It can be written as a sum of positive squares in 4 ways, for example, as 20708724867856 + 393495253264 = 4550684^2 + 627292^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287852 + ... + 6502868.

Almost surely, 2^{21102220121120} is an apocalyptic number.

21102220121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102220121120 is an abundant number, since it is smaller than the sum of its proper divisors (28754132213368).

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

21102220121120 is a wasteful number, since it uses less digits than its factorization.

21102220121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6236253 (or 6236245 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21102220121120 its reverse (2112102220112), we get a palindrome (23214322341232).

The spelling of 21102220121120 in words is "twenty-one trillion, one hundred two billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty".