1001201121020 has 48 divisors (see below), whose sum is σ = 2108025567648. Its totient is φ = 399433482240.

The previous prime is 1001201121001. The next prime is 1001201121031. The reversal of 1001201121020 is 201211021001.

It is a junction number, because it is equal to n+sod(n) for n = 1001201120992 and 1001201121010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12900572 + ... + 12977948.

It is an arithmetic number, because the mean of its divisors is an integer number (43917199326).

Almost surely, 2^{1001201121020} is an apocalyptic number.

1001201121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001201121020 is an abundant number, since it is smaller than the sum of its proper divisors (1106824446628).

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

1001201121020 is a wasteful number, since it uses less digits than its factorization.

1001201121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79070 (or 79068 counting only the distinct ones).

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

Adding to 1001201121020 its reverse (201211021001), we get a palindrome (1202412142021).

The spelling of 1001201121020 in words is "one trillion, one billion, two hundred one million, one hundred twenty-one thousand, twenty".