1021011321020 has 12 divisors (see below), whose sum is σ = 2144123774184. Its totient is φ = 408404528400.

The previous prime is 1021011321019. The next prime is 1021011321059. The reversal of 1021011321020 is 201231101201.

It is a junction number, because it is equal to n+sod(n) for n = 1021011320986 and 1021011321004.

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 3 ways as a sum of consecutive naturals, for example, 25525283006 + ... + 25525283045.

It is an arithmetic number, because the mean of its divisors is an integer number (178676981182).

Almost surely, 2^{1021011321020} is an apocalyptic number.

1021011321020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021011321020 is an abundant number, since it is smaller than the sum of its proper divisors (1123112453164).

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

1021011321020 is a wasteful number, since it uses less digits than its factorization.

1021011321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050566060 (or 51050566058 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1021011321020 its reverse (201231101201), we get a palindrome (1222242422221).

The spelling of 1021011321020 in words is "one trillion, twenty-one billion, eleven million, three hundred twenty-one thousand, twenty".