1211401312 has 96 divisors (see below), whose sum is σ = 2730309120. Its totient is φ = 524090880.

The previous prime is 1211401277. The next prime is 1211401313. The reversal of 1211401312 is 2131041121.

It is a super-4 number, since 4×1211401312⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211401313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 611139 + ... + 613117.

It is an arithmetic number, because the mean of its divisors is an integer number (28440720).

Almost surely, 2^1211401312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211401312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365154560).

1211401312 is an abundant number, since it is smaller than the sum of its proper divisors (1518907808).

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

1211401312 is a wasteful number, since it uses less digits than its factorization.

1211401312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084 (or 2076 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211401312 is about 34805.1908772240. The cubic root of 1211401312 is about 1066.0134392809.

Adding to 1211401312 its reverse (2131041121), we get a palindrome (3342442433).

The spelling of 1211401312 in words is "one billion, two hundred eleven million, four hundred one thousand, three hundred twelve".