1021200101020 has 24 divisors (see below), whose sum is σ = 2339476595568. Its totient is φ = 371345491200.

The previous prime is 1021200100957. The next prime is 1021200101057. The reversal of 1021200101020 is 201010021201.

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 = 1021200100988 and 1021200101006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2320909101 + ... + 2320909540.

It is an arithmetic number, because the mean of its divisors is an integer number (97478191482).

Almost surely, 2^{1021200101020} is an apocalyptic number.

1021200101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021200101020 is an abundant number, since it is smaller than the sum of its proper divisors (1318276494548).

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

1021200101020 is a wasteful number, since it uses less digits than its factorization.

1021200101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4641818661 (or 4641818659 counting only the distinct ones).

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

Adding to 1021200101020 its reverse (201010021201), we get a palindrome (1222210122221).

The spelling of 1021200101020 in words is "one trillion, twenty-one billion, two hundred million, one hundred one thousand, twenty".