212001221121 has 16 divisors (see below), whose sum is σ = 290324989248. Its totient is φ = 137506248000.

The previous prime is 212001221111. The next prime is 212001221123. The reversal of 212001221121 is 121122100212.

It is not a de Polignac number, because 212001221121 - 2⁹ = 212001220609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212001221121.

It is not an unprimeable number, because it can be changed into a prime (212001221123) 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, 2286771 + ... + 2377671.

It is an arithmetic number, because the mean of its divisors is an integer number (18145311828).

Almost surely, 2^212001221121 is an apocalyptic number.

It is an amenable number.

212001221121 is a deficient number, since it is larger than the sum of its proper divisors (78323768127).

212001221121 is a wasteful number, since it uses less digits than its factorization.

212001221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111952.

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

Adding to 212001221121 its reverse (121122100212), we get a palindrome (333123321333).

The spelling of 212001221121 in words is "two hundred twelve billion, one million, two hundred twenty-one thousand, one hundred twenty-one".