11122221012 has 96 divisors (see below), whose sum is σ = 30226232064. Its totient is φ = 3117312000.

The previous prime is 11122221001. The next prime is 11122221023. The reversal of 11122221012 is 21012222111.

It is an interprime number because it is at equal distance from previous prime (11122221001) and next prime (11122221023).

It is a junction number, because it is equal to n+sod(n) for n = 11122220982 and 11122221000.

It is a congruent number.

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, 2052018 + ... + 2057430.

It is an arithmetic number, because the mean of its divisors is an integer number (314856584).

Almost surely, 2^11122221012 is an apocalyptic number.

11122221012 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 11122221012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15113116032).

11122221012 is an abundant number, since it is smaller than the sum of its proper divisors (19104011052).

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

11122221012 is a wasteful number, since it uses less digits than its factorization.

11122221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5889 (or 5887 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11122221012 its reverse (21012222111), we get a palindrome (32134443123).

The spelling of 11122221012 in words is "eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, twelve".