121011210012221 has 8 divisors (see below), whose sum is σ = 125213696044920. Its totient is φ = 116810703025408.

The previous prime is 121011210012191. The next prime is 121011210012241. The reversal of 121011210012221 is 122210012110121.

It can be written as a sum of positive squares in 4 ways, for example, as 77237292825625 + 43773917186596 = 8788475^2 + 6616186^2 .

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 121011210012221 - 2¹⁸ = 121011209750077 is a prime.

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 121011210012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011210012241) 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, 494637056 + ... + 494881641.

It is an arithmetic number, because the mean of its divisors is an integer number (15651712005615).

Almost surely, 2^{121011210012221} is an apocalyptic number.

It is an amenable number.

121011210012221 is a deficient number, since it is larger than the sum of its proper divisors (4202486032699).

121011210012221 is an equidigital number, since it uses as much as digits as its factorization.

121011210012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989522943.

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

Adding to 121011210012221 its reverse (122210012110121), we get a palindrome (243221222122342).

The spelling of 121011210012221 in words is "one hundred twenty-one trillion, eleven billion, two hundred ten million, twelve thousand, two hundred twenty-one".