1211332201221 has 4 divisors (see below), whose sum is σ = 1615109601632. Its totient is φ = 807554800812.

The previous prime is 1211332201141. The next prime is 1211332201243. The reversal of 1211332201221 is 1221022331121.

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 not a de Polignac number, because 1211332201221 - 2¹⁴ = 1211332184837 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 (1211332201271) 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, 201888700201 + ... + 201888700206.

It is an arithmetic number, because the mean of its divisors is an integer number (403777400408).

Almost surely, 2^{1211332201221} is an apocalyptic number.

It is an amenable number.

1211332201221 is a deficient number, since it is larger than the sum of its proper divisors (403777400411).

1211332201221 is an equidigital number, since it uses as much as digits as its factorization.

1211332201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403777400410.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1211332201221 its reverse (1221022331121), we get a palindrome (2432354532342).

The spelling of 1211332201221 in words is "one trillion, two hundred eleven billion, three hundred thirty-two million, two hundred one thousand, two hundred twenty-one".