1021020121020 has 96 divisors (see below), whose sum is σ = 3007563955200. Its totient is φ = 258427665664.

The previous prime is 1021020121007. The next prime is 1021020121039. The reversal of 1021020121020 is 201210201201.

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 = 1021020120987 and 1021020121005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4870164 + ... + 5075483.

It is an arithmetic number, because the mean of its divisors is an integer number (31328791200).

Almost surely, 2^{1021020121020} is an apocalyptic number.

1021020121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021020121020 is an abundant number, since it is smaller than the sum of its proper divisors (1986543834180).

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

1021020121020 is a wasteful number, since it uses less digits than its factorization.

1021020121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9945747 (or 9945745 counting only the distinct ones).

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

Adding to 1021020121020 its reverse (201210201201), we get a palindrome (1222230322221).

The spelling of 1021020121020 in words is "one trillion, twenty-one billion, twenty million, one hundred twenty-one thousand, twenty".