121211010212221 has 4 divisors (see below), whose sum is σ = 125121042799744. Its totient is φ = 117300977624700.

The previous prime is 121211010212219. The next prime is 121211010212287. The reversal of 121211010212221 is 122212010112121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121211010212221 - 2¹ = 121211010212219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211010212921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1955016293715 + ... + 1955016293776.

It is an arithmetic number, because the mean of its divisors is an integer number (31280260699936).

Almost surely, 2^{121211010212221} is an apocalyptic number.

It is an amenable number.

121211010212221 is a deficient number, since it is larger than the sum of its proper divisors (3910032587523).

121211010212221 is an equidigital number, since it uses as much as digits as its factorization.

121211010212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910032587522.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121211010212221 its reverse (122212010112121), we get a palindrome (243423020324342).

The spelling of 121211010212221 in words is "one hundred twenty-one trillion, two hundred eleven billion, ten million, two hundred twelve thousand, two hundred twenty-one".