1020121200020 has 48 divisors (see below), whose sum is σ = 2308073201280. Its totient is φ = 376491993216.

The previous prime is 1020121200013. The next prime is 1020121200031. The reversal of 1020121200020 is 200021210201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1020121199974 and 1020121200010.

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, 291440 + ... + 1457799.

It is an arithmetic number, because the mean of its divisors is an integer number (48084858360).

Almost surely, 2^{1020121200020} is an apocalyptic number.

1020121200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020121200020 is an abundant number, since it is smaller than the sum of its proper divisors (1287952001260).

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

1020121200020 is a wasteful number, since it uses less digits than its factorization.

1020121200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751504 (or 1751502 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1020121200020 its reverse (200021210201), we get a palindrome (1220142410221).

The spelling of 1020121200020 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred thousand, twenty".