21120121011200 has 132 divisors (see below), whose sum is σ = 52440646507920. Its totient is φ = 8433796055040.

The previous prime is 21120121011083. The next prime is 21120121011221. The reversal of 21120121011200 is 211012102112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14485181 + ... + 15876419.

It is an arithmetic number, because the mean of its divisors is an integer number (397277625060).

Almost surely, 2^{21120121011200} is an apocalyptic number.

21120121011200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120121011200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26220323253960).

21120121011200 is an abundant number, since it is smaller than the sum of its proper divisors (31320525496720).

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

21120121011200 is a wasteful number, since it uses less digits than its factorization.

21120121011200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391862 (or 1391839 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21120121011200 its reverse (211012102112), we get a palindrome (21331133113312).

The spelling of 21120121011200 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-one million, eleven thousand, two hundred".