1021111200020 has 24 divisors (see below), whose sum is σ = 2196634339368. Its totient is φ = 398482419200.

The previous prime is 1021111200007. The next prime is 1021111200023. The reversal of 1021111200020 is 200021111201.

It can be written as a sum of positive squares in 4 ways, for example, as 44564054404 + 976547145616 = 211102^2 + 988204^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021111199974 and 1021111200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111200023) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 622627961 + ... + 622629600.

It is an arithmetic number, because the mean of its divisors is an integer number (91526430807).

Almost surely, 2^{1021111200020} is an apocalyptic number.

1021111200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021111200020 is an abundant number, since it is smaller than the sum of its proper divisors (1175523139348).

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

1021111200020 is a wasteful number, since it uses less digits than its factorization.

1021111200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245257611 (or 1245257609 counting only the distinct ones).

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

Adding to 1021111200020 its reverse (200021111201), we get a palindrome (1221132311221).

The spelling of 1021111200020 in words is "one trillion, twenty-one billion, one hundred eleven million, two hundred thousand, twenty".