121221122100211 has 4 divisors (see below), whose sum is σ = 138538425257392. Its totient is φ = 103903818943032.

The previous prime is 121221122100209. The next prime is 121221122100217. The reversal of 121221122100211 is 112001221122121.

It is a happy number.

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 121221122100211 - 2¹ = 121221122100209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221122100217) 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, 8658651578580 + ... + 8658651578593.

It is an arithmetic number, because the mean of its divisors is an integer number (34634606314348).

Almost surely, 2^{121221122100211} is an apocalyptic number.

121221122100211 is a deficient number, since it is larger than the sum of its proper divisors (17317303157181).

121221122100211 is an equidigital number, since it uses as much as digits as its factorization.

121221122100211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17317303157180.

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

Adding to 121221122100211 its reverse (112001221122121), we get a palindrome (233222343222332).

The spelling of 121221122100211 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred thousand, two hundred eleven".