1211401431312 has 20 divisors (see below), whose sum is σ = 3129453697680. Its totient is φ = 403800477088.

The previous prime is 1211401431283. The next prime is 1211401431313. The reversal of 1211401431312 is 2131341041121.

It is a super-3 number, since 3×1211401431312³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1211401431313) 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, 12618764862 + ... + 12618764957.

It is an arithmetic number, because the mean of its divisors is an integer number (156472684884).

Almost surely, 2^{1211401431312} is an apocalyptic number.

1211401431312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211401431312 is an abundant number, since it is smaller than the sum of its proper divisors (1918052266368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211401431312 is a wasteful number, since it uses less digits than its factorization.

1211401431312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25237529830 (or 25237529824 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 1211401431312 its reverse (2131341041121), we get a palindrome (3342742472433).

The spelling of 1211401431312 in words is "one trillion, two hundred eleven billion, four hundred one million, four hundred thirty-one thousand, three hundred twelve".