1211213412 has 60 divisors (see below), whose sum is σ = 3197787516. Its totient is φ = 399729600.

The previous prime is 1211213363. The next prime is 1211213413. The reversal of 1211213412 is 2143121121.

It can be written as a sum of positive squares in 2 ways, for example, as 944087076 + 267126336 = 30726^2 + 16344^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1211213413) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14218 + ... + 51230.

Almost surely, 2^1211213412 is an apocalyptic number.

1211213412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211213412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598893758).

1211213412 is an abundant number, since it is smaller than the sum of its proper divisors (1986574104).

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

1211213412 is a wasteful number, since it uses less digits than its factorization.

1211213412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37130 (or 37119 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1211213412 is about 34802.4914625376. The cubic root of 1211213412 is about 1065.9583201170.

Adding to 1211213412 its reverse (2143121121), we get a palindrome (3354334533).

The spelling of 1211213412 in words is "one billion, two hundred eleven million, two hundred thirteen thousand, four hundred twelve".