1211103012 has 72 divisors (see below), whose sum is σ = 3295203744. Its totient is φ = 345195648.

The previous prime is 1211102999. The next prime is 1211103029. The reversal of 1211103012 is 2103011121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266463 + ... + 270969.

Almost surely, 2^1211103012 is an apocalyptic number.

1211103012 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 1211103012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1647601872).

1211103012 is an abundant number, since it is smaller than the sum of its proper divisors (2084100732).

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

1211103012 is a wasteful number, since it uses less digits than its factorization.

1211103012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4985 (or 4976 counting only the distinct ones).

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

The square root of 1211103012 is about 34800.9053330513. The cubic root of 1211103012 is about 1065.9259323827.

Adding to 1211103012 its reverse (2103011121), we get a palindrome (3314114133).

The spelling of 1211103012 in words is "one billion, two hundred eleven million, one hundred three thousand, twelve".