1100202120221 has 4 divisors (see below), whose sum is σ = 1100492185212. Its totient is φ = 1099912055232.

The previous prime is 1100202120151. The next prime is 1100202120229. The reversal of 1100202120221 is 1220212020011.

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 157728122500 + 942473997721 = 397150^2 + 970811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100202120221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100202120196 and 1100202120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100202120229) 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, 145026806 + ... + 145034391.

It is an arithmetic number, because the mean of its divisors is an integer number (275123046303).

Almost surely, 2^{1100202120221} is an apocalyptic number.

It is an amenable number.

1100202120221 is a deficient number, since it is larger than the sum of its proper divisors (290064991).

1100202120221 is an equidigital number, since it uses as much as digits as its factorization.

1100202120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290064990.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1100202120221 its reverse (1220212020011), we get a palindrome (2320414140232).

The spelling of 1100202120221 in words is "one trillion, one hundred billion, two hundred two million, one hundred twenty thousand, two hundred twenty-one".