121102011221 has 12 divisors (see below), whose sum is σ = 125187601356. Its totient is φ = 117145805760.

The previous prime is 121102011211. The next prime is 121102011241. The reversal of 121102011221 is 122110201121.

It can be written as a sum of positive squares in 2 ways, for example, as 96292296100 + 24809715121 = 310310^2 + 157511^2 .

It is not a de Polignac number, because 121102011221 - 2⁶ = 121102011157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121102011196 and 121102011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102011211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2351075 + ... + 2402031.

It is an arithmetic number, because the mean of its divisors is an integer number (10432300113).

Almost surely, 2^121102011221 is an apocalyptic number.

It is an amenable number.

121102011221 is a deficient number, since it is larger than the sum of its proper divisors (4085590135).

121102011221 is an equidigital number, since it uses as much as digits as its factorization.

121102011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53492 (or 53461 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121102011221 its reverse (122110201121), we get a palindrome (243212212342).

The spelling of 121102011221 in words is "one hundred twenty-one billion, one hundred two million, eleven thousand, two hundred twenty-one".