121221202221211 has 4 divisors (see below), whose sum is σ = 121221458469000. Its totient is φ = 121220945973424.

The previous prime is 121221202221193. The next prime is 121221202221263. The reversal of 121221202221211 is 112122202122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121221202221211 - 2³¹ = 121219054737563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221202221811) 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 3 ways as a sum of consecutive naturals, for example, 127412986 + ... + 128360863.

It is an arithmetic number, because the mean of its divisors is an integer number (30305364617250).

Almost surely, 2^{121221202221211} is an apocalyptic number.

121221202221211 is a deficient number, since it is larger than the sum of its proper divisors (256247789).

121221202221211 is an equidigital number, since it uses as much as digits as its factorization.

121221202221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256247788.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121221202221211 its reverse (112122202122121), we get a palindrome (233343404343332).

The spelling of 121221202221211 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred eleven".