1211103120 has 160 divisors (see below), whose sum is σ = 4015992960. Its totient is φ = 300851200.

The previous prime is 1211103043. The next prime is 1211103139. The reversal of 1211103120 is 213011121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1211103096 and 1211103105.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 410611 + ... + 413549.

It is an arithmetic number, because the mean of its divisors is an integer number (25099956).

Almost surely, 2^1211103120 is an apocalyptic number.

1211103120 is a gapful number since it is divisible by the number (10) 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 1211103120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2007996480).

1211103120 is an abundant number, since it is smaller than the sum of its proper divisors (2804889840).

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

1211103120 is a wasteful number, since it uses less digits than its factorization.

1211103120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073 (or 3067 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1211103120 is about 34800.9068847351. The cubic root of 1211103120 is about 1065.9259640673.

Adding to 1211103120 its reverse (213011121), we get a palindrome (1424114241).

The spelling of 1211103120 in words is "one billion, two hundred eleven million, one hundred three thousand, one hundred twenty".