201211122211021 has 8 divisors (see below), whose sum is σ = 218922807038264. Its totient is φ = 183818566840320.

The previous prime is 201211122210983. The next prime is 201211122211037. The reversal of 201211122211021 is 120112221112102.

It is a happy number.

201211122211021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1842765525225 + 199368356685796 = 1357485^2 + 14119786^2 .

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 201211122211021 - 2¹¹ = 201211122208973 is a prime.

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 201211122211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211122211061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79782362820 + ... + 79782365341.

It is an arithmetic number, because the mean of its divisors is an integer number (27365350879783).

Almost surely, 2^{201211122211021} is an apocalyptic number.

It is an amenable number.

201211122211021 is a deficient number, since it is larger than the sum of its proper divisors (17711684827243).

201211122211021 is a wasteful number, since it uses less digits than its factorization.

201211122211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159564728271.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201211122211021 its reverse (120112221112102), we get a palindrome (321323343323123).

The spelling of 201211122211021 in words is "two hundred one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".