1020121220020 has 48 divisors (see below), whose sum is σ = 2475799845120. Its totient is φ = 345826001664.

The previous prime is 1020121220011. The next prime is 1020121220087. The reversal of 1020121220020 is 200221210201.

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, 40923384 + ... + 40948303.

It is an arithmetic number, because the mean of its divisors is an integer number (51579163440).

Almost surely, 2^{1020121220020} is an apocalyptic number.

1020121220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020121220020 is an abundant number, since it is smaller than the sum of its proper divisors (1455678625100).

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

1020121220020 is a wasteful number, since it uses less digits than its factorization.

1020121220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81871792 (or 81871790 counting only the distinct ones).

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

Adding to 1020121220020 its reverse (200221210201), we get a palindrome (1220342430221).

The spelling of 1020121220020 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred twenty thousand, twenty".