1021002011020 has 12 divisors (see below), whose sum is σ = 2144104223184. Its totient is φ = 408400804400.

The previous prime is 1021002010967. The next prime is 1021002011023. The reversal of 1021002011020 is 201102001201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1021002010988 and 1021002011006.

It is not an unprimeable number, because it can be changed into a prime (1021002011023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25525050256 + ... + 25525050295.

It is an arithmetic number, because the mean of its divisors is an integer number (178675351932).

Almost surely, 2^{1021002011020} is an apocalyptic number.

1021002011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021002011020 is an abundant number, since it is smaller than the sum of its proper divisors (1123102212164).

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

1021002011020 is a wasteful number, since it uses less digits than its factorization.

1021002011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050100560 (or 51050100558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021002011020 its reverse (201102001201), we get a palindrome (1222104012221).

The spelling of 1021002011020 in words is "one trillion, twenty-one billion, two million, eleven thousand, twenty".