2021121000120 has 128 divisors (see below), whose sum is σ = 6383381587200. Its totient is φ = 510527453184.

The previous prime is 2021121000113. The next prime is 2021121000121. The reversal of 2021121000120 is 210001211202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2021121000096 and 2021121000105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121000121) 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, 17276544 + ... + 17393136.

It is an arithmetic number, because the mean of its divisors is an integer number (49870168650).

Almost surely, 2^{2021121000120} is an apocalyptic number.

2021121000120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021121000120 is an abundant number, since it is smaller than the sum of its proper divisors (4362260587080).

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

2021121000120 is a wasteful number, since it uses less digits than its factorization.

2021121000120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124229 (or 124225 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2021121000120 its reverse (210001211202), we get a palindrome (2231122211322).

The spelling of 2021121000120 in words is "two trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty", and thus it is an aban number.