11211111012 has 48 divisors (see below), whose sum is σ = 27174801024. Its totient is φ = 3594528000.

The previous prime is 11211110993. The next prime is 11211111017. The reversal of 11211111012 is 21011111211.

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

It is not an unprimeable number, because it can be changed into a prime (11211111017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125539 + ... + 195402.

It is an arithmetic number, because the mean of its divisors is an integer number (566141688).

Almost surely, 2^11211111012 is an apocalyptic number.

11211111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11211111012 is an abundant number, since it is smaller than the sum of its proper divisors (15963690012).

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

11211111012 is a wasteful number, since it uses less digits than its factorization.

11211111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321060 (or 321058 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11211111012 its reverse (21011111211), we get a palindrome (32222222223).

The spelling of 11211111012 in words is "eleven billion, two hundred eleven million, one hundred eleven thousand, twelve".