12121102221 has 16 divisors (see below), whose sum is σ = 17134685568. Its totient is φ = 7595379200.

The previous prime is 12121102211. The next prime is 12121102223. The reversal of 12121102221 is 12220112121.

It is a cyclic number.

It is not a de Polignac number, because 12121102221 - 2⁷ = 12121102093 is a prime.

It is a super-2 number, since 2×12121102221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12121102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121102223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117345 + ... + 194966.

It is an arithmetic number, because the mean of its divisors is an integer number (1070917848).

Almost surely, 2^12121102221 is an apocalyptic number.

It is an amenable number.

12121102221 is a deficient number, since it is larger than the sum of its proper divisors (5013583347).

12121102221 is a wasteful number, since it uses less digits than its factorization.

12121102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313092.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12121102221 its reverse (12220112121), we get a palindrome (24341214342).

The spelling of 12121102221 in words is "twelve billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".