1211111444 has 12 divisors (see below), whose sum is σ = 2124276000. Its totient is φ = 604175448.

The previous prime is 1211111443. The next prime is 1211111449. The reversal of 1211111444 is 4441111121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343094 + ... + 346605.

It is an arithmetic number, because the mean of its divisors is an integer number (177023000).

Almost surely, 2^1211111444 is an apocalyptic number.

It is an amenable number.

1211111444 is a deficient number, since it is larger than the sum of its proper divisors (913164556).

1211111444 is a wasteful number, since it uses less digits than its factorization.

1211111444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690142 (or 690140 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

The square root of 1211111444 is about 34801.0264791141. The cubic root of 1211111444 is about 1065.9284061240.

Adding to 1211111444 its reverse (4441111121), we get a palindrome (5652222565).

The spelling of 1211111444 in words is "one billion, two hundred eleven million, one hundred eleven thousand, four hundred forty-four".