12121210110221 has 16 divisors (see below), whose sum is σ = 13029096447360. Its totient is φ = 11248223162880.

The previous prime is 12121210110199. The next prime is 12121210110223. The reversal of 12121210110221 is 12201101212121.

It is a cyclic number.

It is not a de Polignac number, because 12121210110221 - 2⁴² = 7723163599117 is a prime.

It is a super-2 number, since 2×12121210110221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121210110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121210110223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35735900 + ... + 36073493.

It is an arithmetic number, because the mean of its divisors is an integer number (814318527960).

Almost surely, 2^{12121210110221} is an apocalyptic number.

It is an amenable number.

12121210110221 is a deficient number, since it is larger than the sum of its proper divisors (907886337139).

12121210110221 is a wasteful number, since it uses less digits than its factorization.

12121210110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71809636.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12121210110221 its reverse (12201101212121), we get a palindrome (24322311322342).

The spelling of 12121210110221 in words is "twelve trillion, one hundred twenty-one billion, two hundred ten million, one hundred ten thousand, two hundred twenty-one".