1100202120121 has 4 divisors (see below), whose sum is σ = 1184833052452. Its totient is φ = 1015571187792.

The previous prime is 1100202120103. The next prime is 1100202120151. The reversal of 1100202120121 is 1210212020011.

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 752054918521 + 348147201600 = 867211^2 + 590040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100202120121 - 2⁹ = 1100202119609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 84630932317 = 1100202120121 / (1 + 1 + 0 + 0 + 2 + 0 + 2 + 1 + 2 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100202120151) 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, 42315466146 + ... + 42315466171.

It is an arithmetic number, because the mean of its divisors is an integer number (296208263113).

Almost surely, 2^{1100202120121} is an apocalyptic number.

It is an amenable number.

1100202120121 is a deficient number, since it is larger than the sum of its proper divisors (84630932331).

1100202120121 is an equidigital number, since it uses as much as digits as its factorization.

1100202120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84630932330.

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

Adding to 1100202120121 its reverse (1210212020011), we get a palindrome (2310414140132).

The spelling of 1100202120121 in words is "one trillion, one hundred billion, two hundred two million, one hundred twenty thousand, one hundred twenty-one".