1001111101020 has 36 divisors (see below), whose sum is σ = 3036703673640. Its totient is φ = 266962960224.

The previous prime is 1001111101009. The next prime is 1001111101061. The reversal of 1001111101020 is 201011111001.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001111100993 and 1001111101011.

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 11 ways as a sum of consecutive naturals, for example, 2780863990 + ... + 2780864349.

Almost surely, 2^{1001111101020} is an apocalyptic number.

1001111101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001111101020 is an abundant number, since it is smaller than the sum of its proper divisors (2035592572620).

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

1001111101020 is a wasteful number, since it uses less digits than its factorization.

1001111101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561728354 (or 5561728349 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1001111101020 its reverse (201011111001), we get a palindrome (1202122212021).

The spelling of 1001111101020 in words is "one trillion, one billion, one hundred eleven million, one hundred one thousand, twenty".