1102121210221 has 4 divisors (see below), whose sum is σ = 1102371867612. Its totient is φ = 1101870552832.

The previous prime is 1102121210213. The next prime is 1102121210231. The reversal of 1102121210221 is 1220121212011.

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 837087755625 + 265033454596 = 914925^2 + 514814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1102121210221 - 2³ = 1102121210213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1102121210195 and 1102121210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102121210231) 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, 125322100 + ... + 125330893.

It is an arithmetic number, because the mean of its divisors is an integer number (275592966903).

Almost surely, 2^{1102121210221} is an apocalyptic number.

It is an amenable number.

1102121210221 is a deficient number, since it is larger than the sum of its proper divisors (250657391).

1102121210221 is an equidigital number, since it uses as much as digits as its factorization.

1102121210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250657390.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1102121210221 its reverse (1220121212011), we get a palindrome (2322242422232).

The spelling of 1102121210221 in words is "one trillion, one hundred two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".