1001012121020 has 12 divisors (see below), whose sum is σ = 2102125454184. Its totient is φ = 400404848400.

The previous prime is 1001012120981. The next prime is 1001012121029. The reversal of 1001012121020 is 201212101001.

It is a junction number, because it is equal to n+sod(n) for n = 1001012120992 and 1001012121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001012121029) 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, 25025303006 + ... + 25025303045.

It is an arithmetic number, because the mean of its divisors is an integer number (175177121182).

Almost surely, 2^{1001012121020} is an apocalyptic number.

1001012121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001012121020 is an abundant number, since it is smaller than the sum of its proper divisors (1101113333164).

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

1001012121020 is a wasteful number, since it uses less digits than its factorization.

1001012121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50050606060 (or 50050606058 counting only the distinct ones).

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

Adding to 1001012121020 its reverse (201212101001), we get a palindrome (1202224222021).

The spelling of 1001012121020 in words is "one trillion, one billion, twelve million, one hundred twenty-one thousand, twenty".