2021121200120 has 128 divisors (see below), whose sum is σ = 5254517226240. Its totient is φ = 691488368640.

The previous prime is 2021121200081. The next prime is 2021121200129. The reversal of 2021121200120 is 210021211202.

It is a junction number, because it is equal to n+sod(n) for n = 2021121200095 and 2021121200104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121200129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23017019 + ... + 23104661.

It is an arithmetic number, because the mean of its divisors is an integer number (41050915830).

Almost surely, 2^{2021121200120} is an apocalyptic number.

2021121200120 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 2021121200120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2627258613120).

2021121200120 is an abundant number, since it is smaller than the sum of its proper divisors (3233396026120).

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

2021121200120 is a wasteful number, since it uses less digits than its factorization.

2021121200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90765 (or 90761 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2021121200120 its reverse (210021211202), we get a palindrome (2231142411322).

The spelling of 2021121200120 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred thousand, one hundred twenty".