1211340132221 has 4 divisors (see below), whose sum is σ = 1212258511200. Its totient is φ = 1210421753244.

The previous prime is 1211340132217. The next prime is 1211340132239. The reversal of 1211340132221 is 1222310431121.

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 1211340132221 - 2² = 1211340132217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211340132271) 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, 459187511 + ... + 459190148.

It is an arithmetic number, because the mean of its divisors is an integer number (303064627800).

Almost surely, 2^{1211340132221} is an apocalyptic number.

It is an amenable number.

1211340132221 is a deficient number, since it is larger than the sum of its proper divisors (918378979).

1211340132221 is an equidigital number, since it uses as much as digits as its factorization.

1211340132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918378978.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 1211340132221 its reverse (1222310431121), we get a palindrome (2433650563342).

The spelling of 1211340132221 in words is "one trillion, two hundred eleven billion, three hundred forty million, one hundred thirty-two thousand, two hundred twenty-one".