1211401431311 has 8 divisors (see below), whose sum is σ = 1278037873920. Its totient is φ = 1145052835992.

The previous prime is 1211401431283. The next prime is 1211401431313. The reversal of 1211401431311 is 1131341041121.

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 1211401431311 - 2¹⁰ = 1211401430287 is a prime.

It is a super-3 number, since 3×1211401431311³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211401431313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71953175 + ... + 71970008.

It is an arithmetic number, because the mean of its divisors is an integer number (159754734240).

Almost surely, 2^{1211401431311} is an apocalyptic number.

1211401431311 is a deficient number, since it is larger than the sum of its proper divisors (66636442609).

1211401431311 is a wasteful number, since it uses less digits than its factorization.

1211401431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143923645.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 1211401431311 its reverse (1131341041121), we get a palindrome (2342742472432).

The spelling of 1211401431311 in words is "one trillion, two hundred eleven billion, four hundred one million, four hundred thirty-one thousand, three hundred eleven".