12121010012221 has 8 divisors (see below), whose sum is σ = 13353840014688. Its totient is φ = 10910000010000.

The previous prime is 12121010012219. The next prime is 12121010012227. The reversal of 12121010012221 is 12221001012121.

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 12121010012221 - 2¹ = 12121010012219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121010012195 and 12121010012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121010012227) 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 7 ways as a sum of consecutive naturals, for example, 5454998895 + ... + 5455001116.

It is an arithmetic number, because the mean of its divisors is an integer number (1669230001836).

Almost surely, 2^{12121010012221} is an apocalyptic number.

12121010012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12121010012221 is a deficient number, since it is larger than the sum of its proper divisors (1232830002467).

12121010012221 is a wasteful number, since it uses less digits than its factorization.

12121010012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910000123.

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

Adding to 12121010012221 its reverse (12221001012121), we get a palindrome (24342011024342).

The spelling of 12121010012221 in words is "twelve trillion, one hundred twenty-one billion, ten million, twelve thousand, two hundred twenty-one".