1021012120020 has 24 divisors (see below), whose sum is σ = 2858833936224. Its totient is φ = 272269898656.

The previous prime is 1021012120003. The next prime is 1021012120069. The reversal of 1021012120020 is 200212101201.

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 = 1021012119978 and 1021012120005.

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, 8508434274 + ... + 8508434393.

It is an arithmetic number, because the mean of its divisors is an integer number (119118080676).

Almost surely, 2^{1021012120020} is an apocalyptic number.

1021012120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021012120020 is an abundant number, since it is smaller than the sum of its proper divisors (1837821816204).

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

1021012120020 is a wasteful number, since it uses less digits than its factorization.

1021012120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17016868679 (or 17016868677 counting only the distinct ones).

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

Adding to 1021012120020 its reverse (200212101201), we get a palindrome (1221224221221).

The spelling of 1021012120020 in words is "one trillion, twenty-one billion, twelve million, one hundred twenty thousand, twenty".