1121021100020 has 24 divisors (see below), whose sum is σ = 2408891853984. Its totient is φ = 437980336416.

The previous prime is 1121021100019. The next prime is 1121021100041. The reversal of 1121021100020 is 200011201211.

It is a junction number, because it is equal to n+sod(n) for n = 1121021099974 and 1121021100010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651755594 + ... + 651757313.

It is an arithmetic number, because the mean of its divisors is an integer number (100370493916).

Almost surely, 2^{1121021100020} is an apocalyptic number.

1121021100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121021100020 is an abundant number, since it is smaller than the sum of its proper divisors (1287870753964).

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

1121021100020 is a wasteful number, since it uses less digits than its factorization.

1121021100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303512959 (or 1303512957 counting only the distinct ones).

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

Adding to 1121021100020 its reverse (200011201211), we get a palindrome (1321032301231).

The spelling of 1121021100020 in words is "one trillion, one hundred twenty-one billion, twenty-one million, one hundred thousand, twenty".