201210221121 has 32 divisors (see below), whose sum is σ = 330336534528. Its totient is φ = 106086127680.

The previous prime is 201210221119. The next prime is 201210221131. The reversal of 201210221121 is 121122012102.

It is not a de Polignac number, because 201210221121 - 2¹ = 201210221119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201210221121.

It is not an unprimeable number, because it can be changed into a prime (201210221131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 463216 + ... + 785486.

It is an arithmetic number, because the mean of its divisors is an integer number (10323016704).

Almost surely, 2^201210221121 is an apocalyptic number.

201210221121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201210221121 is a deficient number, since it is larger than the sum of its proper divisors (129126313407).

201210221121 is a wasteful number, since it uses less digits than its factorization.

201210221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324581.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201210221121 its reverse (121122012102), we get a palindrome (322332233223).

The spelling of 201210221121 in words is "two hundred one billion, two hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".