1021201101020 has 24 divisors (see below), whose sum is σ = 2149298550000. Its totient is φ = 407570680832.

The previous prime is 1021201100999. The next prime is 1021201101043. The reversal of 1021201101020 is 201011021201.

It is a junction number, because it is equal to n+sod(n) for n = 1021201100992 and 1021201101010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56850770 + ... + 56868729.

It is an arithmetic number, because the mean of its divisors is an integer number (89554106250).

Almost surely, 2^{1021201101020} is an apocalyptic number.

1021201101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021201101020 is an abundant number, since it is smaller than the sum of its proper divisors (1128097448980).

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

1021201101020 is a wasteful number, since it uses less digits than its factorization.

1021201101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113719957 (or 113719955 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1021201101020 its reverse (201011021201), we get a palindrome (1222212122221).

The spelling of 1021201101020 in words is "one trillion, twenty-one billion, two hundred one million, one hundred one thousand, twenty".