2102120021020 has 48 divisors (see below), whose sum is σ = 4470694794720. Its totient is φ = 830189627136.

The previous prime is 2102120020999. The next prime is 2102120021069. The reversal of 2102120021020 is 201200212012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086727 + ... + 2320606.

It is an arithmetic number, because the mean of its divisors is an integer number (93139474890).

Almost surely, 2^{2102120021020} is an apocalyptic number.

2102120021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102120021020 is an abundant number, since it is smaller than the sum of its proper divisors (2368574773700).

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

2102120021020 is a wasteful number, since it uses less digits than its factorization.

2102120021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407734 (or 3407732 counting only the distinct ones).

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

Adding to 2102120021020 its reverse (201200212012), we get a palindrome (2303320233032).

The spelling of 2102120021020 in words is "two trillion, one hundred two billion, one hundred twenty million, twenty-one thousand, twenty".