121221020210211 has 64 divisors (see below), whose sum is σ = 182471594572800. Its totient is φ = 79526316264192.

The previous prime is 121221020210201. The next prime is 121221020210219. The reversal of 121221020210211 is 112012020122121.

121221020210211 is a `hidden beast` number, since 1 + 2 + 1 + 221 + 0 + 20 + 210 + 211 = 666.

It is not a de Polignac number, because 121221020210211 - 2¹³ = 121221020202019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221020210219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 713261001 + ... + 713430933.

It is an arithmetic number, because the mean of its divisors is an integer number (2851118665200).

Almost surely, 2^{121221020210211} is an apocalyptic number.

121221020210211 is a deficient number, since it is larger than the sum of its proper divisors (61250574362589).

121221020210211 is a wasteful number, since it uses less digits than its factorization.

121221020210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171657 (or 171651 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121221020210211 its reverse (112012020122121), we get a palindrome (233233040332332).

The spelling of 121221020210211 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred ten thousand, two hundred eleven".