201211132021 has 4 divisors (see below), whose sum is σ = 203967448972. Its totient is φ = 198454815072.

The previous prime is 201211131949. The next prime is 201211132061. The reversal of 201211132021 is 120231112102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51093629521 + 150117502500 = 226039^2 + 387450^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211132021 - 2²⁵ = 201177577589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201211131986 and 201211132004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211132061) 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, 1378158366 + ... + 1378158511.

It is an arithmetic number, because the mean of its divisors is an integer number (50991862243).

Almost surely, 2^201211132021 is an apocalyptic number.

It is an amenable number.

201211132021 is a deficient number, since it is larger than the sum of its proper divisors (2756316951).

201211132021 is an equidigital number, since it uses as much as digits as its factorization.

201211132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756316950.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 201211132021 its reverse (120231112102), we get a palindrome (321442244123).

The spelling of 201211132021 in words is "two hundred one billion, two hundred eleven million, one hundred thirty-two thousand, twenty-one".