1211031342 has 12 divisors (see below), whose sum is σ = 2623901280. Its totient is φ = 403677108.

The previous prime is 1211031331. The next prime is 1211031347. The reversal of 1211031342 is 2431301121.

It is a super-2 number, since 2×1211031342² = 2933193822612641928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67279519 = 1211031342 / (1 + 2 + 1 + 1 + 0 + 3 + 1 + 3 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211031347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33639742 + ... + 33639777.

It is an arithmetic number, because the mean of its divisors is an integer number (218658440).

Almost surely, 2^1211031342 is an apocalyptic number.

1211031342 is an abundant number, since it is smaller than the sum of its proper divisors (1412869938).

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

1211031342 is a wasteful number, since it uses less digits than its factorization.

1211031342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67279527 (or 67279524 counting only the distinct ones).

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

The square root of 1211031342 is about 34799.8756032259. The cubic root of 1211031342 is about 1065.9049057049.

Adding to 1211031342 its reverse (2431301121), we get a palindrome (3642332463).

The spelling of 1211031342 in words is "one billion, two hundred eleven million, thirty-one thousand, three hundred forty-two".