1211443320311 has 48 divisors (see below), whose sum is σ = 1479394430976. Its totient is φ = 971560203264.

The previous prime is 1211443320299. The next prime is 1211443320349. The reversal of 1211443320311 is 1130233441121.

It is not a de Polignac number, because 1211443320311 - 2⁶ = 1211443320247 is a prime.

It is a super-3 number, since 3×1211443320311³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211443325311) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 436240355 + ... + 436243131.

It is an arithmetic number, because the mean of its divisors is an integer number (30820717312).

Almost surely, 2^{1211443320311} is an apocalyptic number.

1211443320311 is a deficient number, since it is larger than the sum of its proper divisors (267951110665).

1211443320311 is a wasteful number, since it uses less digits than its factorization.

1211443320311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008 (or 3991 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1211443320311 its reverse (1130233441121), we get a palindrome (2341676761432).

The spelling of 1211443320311 in words is "one trillion, two hundred eleven billion, four hundred forty-three million, three hundred twenty thousand, three hundred eleven".