11111221021012 has 24 divisors (see below), whose sum is σ = 22222521970880. Its totient is φ = 4761934738560.

The previous prime is 11111221021007. The next prime is 11111221021057. The reversal of 11111221021012 is 21012012211111.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10067587 + ... + 11116597.

Almost surely, 2^{11111221021012} is an apocalyptic number.

It is an amenable number.

11111221021012 is an abundant number, since it is smaller than the sum of its proper divisors (11111300949868).

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

11111221021012 is a wasteful number, since it uses less digits than its factorization.

11111221021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427311 (or 1427309 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 11111221021012 its reverse (21012012211111), we get a palindrome (32123233232123).

The spelling of 11111221021012 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, twenty-one thousand, twelve".