1121100020021 has 4 divisors (see below), whose sum is σ = 1121102152044. Its totient is φ = 1121097888000.

The previous prime is 1121100020011. The next prime is 1121100020041. The reversal of 1121100020021 is 1200200011211.

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 923301904996 + 197798115025 = 960886^2 + 444745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121100020021 - 2⁶ = 1121100019957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121100019984 and 1121100020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121100020011) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 347591 + ... + 1537211.

It is an arithmetic number, because the mean of its divisors is an integer number (280275538011).

Almost surely, 2^{1121100020021} is an apocalyptic number.

It is an amenable number.

1121100020021 is a deficient number, since it is larger than the sum of its proper divisors (2132023).

1121100020021 is an equidigital number, since it uses as much as digits as its factorization.

1121100020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132022.

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

Adding to 1121100020021 its reverse (1200200011211), we get a palindrome (2321300031232).

The spelling of 1121100020021 in words is "one trillion, one hundred twenty-one billion, one hundred million, twenty thousand, twenty-one".