211221200210121 has 12 divisors (see below), whose sum is σ = 305141461468272. Its totient is φ = 140793746269176.

The previous prime is 211221200210107. The next prime is 211221200210147. The reversal of 211221200210121 is 121012002122112.

211221200210121 is a `hidden beast` number, since 2 + 11 + 221 + 200 + 210 + 1 + 21 = 666.

It is not a de Polignac number, because 211221200210121 - 2⁶ = 211221200210057 is a prime.

It is a super-2 number, since 2×211221200210121² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221200210094 and 211221200210103.

It is not an unprimeable number, because it can be changed into a prime (211221200210221) 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 11 ways as a sum of consecutive naturals, for example, 1698868071 + ... + 1698992396.

It is an arithmetic number, because the mean of its divisors is an integer number (25428455122356).

Almost surely, 2^{211221200210121} is an apocalyptic number.

It is an amenable number.

211221200210121 is a deficient number, since it is larger than the sum of its proper divisors (93920261258151).

211221200210121 is a wasteful number, since it uses less digits than its factorization.

211221200210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397867380 (or 3397867377 counting only the distinct ones).

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

Adding to 211221200210121 its reverse (121012002122112), we get a palindrome (332233202332233).

The spelling of 211221200210121 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred million, two hundred ten thousand, one hundred twenty-one".