2121002120020 has 48 divisors (see below), whose sum is σ = 5166381306240. Its totient is φ = 716346981504.

The previous prime is 2121002120011. The next prime is 2121002120023. The reversal of 2121002120020 is 200212001212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121002120023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113050435 + ... + 113069194.

It is an arithmetic number, because the mean of its divisors is an integer number (107632943880).

Almost surely, 2^{2121002120020} is an apocalyptic number.

2121002120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121002120020 is an abundant number, since it is smaller than the sum of its proper divisors (3045379186220).

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

2121002120020 is a wasteful number, since it uses less digits than its factorization.

2121002120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226119712 (or 226119710 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2121002120020 its reverse (200212001212), we get a palindrome (2321214121232).

The spelling of 2121002120020 in words is "two trillion, one hundred twenty-one billion, two million, one hundred twenty thousand, twenty".