1211241138 has 16 divisors (see below), whose sum is σ = 2424391680. Its totient is φ = 403428816.

The previous prime is 1211241137. The next prime is 1211241151. The reversal of 1211241138 is 8311421121.

It is not an unprimeable number, because it can be changed into a prime (1211241133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 71245 + ... + 86592.

It is an arithmetic number, because the mean of its divisors is an integer number (151524480).

Almost surely, 2^1211241138 is an apocalyptic number.

1211241138 is an abundant number, since it is smaller than the sum of its proper divisors (1213150542).

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

1211241138 is a wasteful number, since it uses less digits than its factorization.

1211241138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159121.

The product of its digits is 384, while the sum is 24.

The square root of 1211241138 is about 34802.8897938088. The cubic root of 1211241138 is about 1065.9664537056.

Adding to 1211241138 its reverse (8311421121), we get a palindrome (9522662259).

The spelling of 1211241138 in words is "one billion, two hundred eleven million, two hundred forty-one thousand, one hundred thirty-eight".