201212211121 has 8 divisors (see below), whose sum is σ = 205909513920. Its totient is φ = 196515724272.

The previous prime is 201212211061. The next prime is 201212211133. The reversal of 201212211121 is 121112212102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201212211121 - 2¹⁹ = 201211686833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201212211095 and 201212211104.

It is not an unprimeable number, because it can be changed into a prime (201212212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309900 + ... + 706018.

It is an arithmetic number, because the mean of its divisors is an integer number (25738689240).

Almost surely, 2^201212211121 is an apocalyptic number.

It is an amenable number.

201212211121 is a deficient number, since it is larger than the sum of its proper divisors (4697302799).

201212211121 is a wasteful number, since it uses less digits than its factorization.

201212211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407975.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201212211121 its reverse (121112212102), we get a palindrome (322324423223).

The spelling of 201212211121 in words is "two hundred one billion, two hundred twelve million, two hundred eleven thousand, one hundred twenty-one".