121221021210211 has 16 divisors (see below), whose sum is σ = 138508704298944. Its totient is φ = 105097939375104.

The previous prime is 121221021210199. The next prime is 121221021210221. The reversal of 121221021210211 is 112012120122121.

It is a happy number.

It is not a de Polignac number, because 121221021210211 - 2¹⁷ = 121221021079139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221021210221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563045770 + ... + 563261023.

It is an arithmetic number, because the mean of its divisors is an integer number (8656794018684).

Almost surely, 2^{121221021210211} is an apocalyptic number.

121221021210211 is a deficient number, since it is larger than the sum of its proper divisors (17287683088733).

121221021210211 is a wasteful number, since it uses less digits than its factorization.

121221021210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126307310.

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

Adding to 121221021210211 its reverse (112012120122121), we get a palindrome (233233141332332).

The spelling of 121221021210211 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred ten thousand, two hundred eleven".