12121022022221 has 8 divisors (see below), whose sum is σ = 13852668882624. Its totient is φ = 10389393233280.

The previous prime is 12121022022181. The next prime is 12121022022257. The reversal of 12121022022221 is 12222022012121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121022022221 - 2¹⁸ = 12121021760077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121022022193 and 12121022022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121021022221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3048740 + ... + 5791101.

It is an arithmetic number, because the mean of its divisors is an integer number (1731583610328).

Almost surely, 2^{12121022022221} is an apocalyptic number.

It is an amenable number.

12121022022221 is a deficient number, since it is larger than the sum of its proper divisors (1731646860403).

12121022022221 is an equidigital number, since it uses as much as digits as its factorization.

12121022022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9035731.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12121022022221 its reverse (12222022012121), we get a palindrome (24343044034342).

It can be divided in two parts, 1212102 and 2022221, that added together give a palindrome (3234323).

The spelling of 12121022022221 in words is "twelve trillion, one hundred twenty-one billion, twenty-two million, twenty-two thousand, two hundred twenty-one".