1211343012 has 120 divisors (see below), whose sum is σ = 3469664352. Its totient is φ = 365472000.

The previous prime is 1211342921. The next prime is 1211343061. The reversal of 1211343012 is 2103431121.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1008012 + ... + 1009212.

Almost surely, 2^1211343012 is an apocalyptic number.

1211343012 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 1211343012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1734832176).

1211343012 is an abundant number, since it is smaller than the sum of its proper divisors (2258321340).

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

1211343012 is a wasteful number, since it uses less digits than its factorization.

1211343012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1500 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1211343012 is about 34804.3533483959. The cubic root of 1211343012 is about 1065.9963379895.

Adding to 1211343012 its reverse (2103431121), we get a palindrome (3314774133).

The spelling of 1211343012 in words is "one billion, two hundred eleven million, three hundred forty-three thousand, twelve".