201211002111221 has 4 divisors (see below), whose sum is σ = 201239915899200. Its totient is φ = 201182088323244.

The previous prime is 201211002111211. The next prime is 201211002111263. The reversal of 201211002111221 is 122111200112102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201211002111221 - 2⁶ = 201211002111157 is a prime.

It is a super-2 number, since 2×201211002111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201211002111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211002111211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14456883551 + ... + 14456897468.

It is an arithmetic number, because the mean of its divisors is an integer number (50309978974800).

Almost surely, 2^{201211002111221} is an apocalyptic number.

It is an amenable number.

201211002111221 is a deficient number, since it is larger than the sum of its proper divisors (28913787979).

201211002111221 is an equidigital number, since it uses as much as digits as its factorization.

201211002111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28913787978.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201211002111221 its reverse (122111200112102), we get a palindrome (323322202223323).

The spelling of 201211002111221 in words is "two hundred one trillion, two hundred eleven billion, two million, one hundred eleven thousand, two hundred twenty-one".