1100202020021 has 4 divisors (see below), whose sum is σ = 1184832944652. Its totient is φ = 1015571095392.

The previous prime is 1100202020017. The next prime is 1100202020053. The reversal of 1100202020021 is 1200202020011.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 644190838225 + 456011181796 = 802615^2 + 675286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100202020021 - 2² = 1100202020017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100202019984 and 1100202020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100202020921) 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, 42315462296 + ... + 42315462321.

It is an arithmetic number, because the mean of its divisors is an integer number (296208236163).

Almost surely, 2^{1100202020021} is an apocalyptic number.

It is an amenable number.

1100202020021 is a deficient number, since it is larger than the sum of its proper divisors (84630924631).

1100202020021 is an equidigital number, since it uses as much as digits as its factorization.

1100202020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84630924630.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1100202020021 its reverse (1200202020011), we get a palindrome (2300404040032).

The spelling of 1100202020021 in words is "one trillion, one hundred billion, two hundred two million, twenty thousand, twenty-one".