1121100202021 has 4 divisors (see below), whose sum is σ = 1121117437612. Its totient is φ = 1121082966432.

The previous prime is 1121100202007. The next prime is 1121100202037. The reversal of 1121100202021 is 1202020011211.

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 583680720100 + 537419481921 = 763990^2 + 733089^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121100202021 - 2²¹ = 1121098104869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121100201992 and 1121100202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121100202051) 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, 8519856 + ... + 8650441.

It is an arithmetic number, because the mean of its divisors is an integer number (280279359403).

Almost surely, 2^{1121100202021} is an apocalyptic number.

It is an amenable number.

1121100202021 is a deficient number, since it is larger than the sum of its proper divisors (17235591).

1121100202021 is an equidigital number, since it uses as much as digits as its factorization.

1121100202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17235590.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1121100202021 its reverse (1202020011211), we get a palindrome (2323120213232).

The spelling of 1121100202021 in words is "one trillion, one hundred twenty-one billion, one hundred million, two hundred two thousand, twenty-one".