11111221000012 has 24 divisors (see below), whose sum is σ = 22430128379904. Its totient is φ = 4717447632912.

The previous prime is 11111220999979. The next prime is 11111221000021. The reversal of 11111221000012 is 21000012211111.

It is a happy number.

It is a super-2 number, since 2×11111221000012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11111220999956 and 11111221000001.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1854339628 + ... + 1854345619.

It is an arithmetic number, because the mean of its divisors is an integer number (934588682496).

Almost surely, 2^{11111221000012} is an apocalyptic number.

It is an amenable number.

11111221000012 is an abundant number, since it is smaller than the sum of its proper divisors (11318907379892).

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

11111221000012 is a wasteful number, since it uses less digits than its factorization.

11111221000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708685365 (or 3708685363 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11111221000012 its reverse (21000012211111), we get a palindrome (32111233211123).

The spelling of 11111221000012 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, twelve", and thus it is an aban number.