11221221021012 has 168 divisors, whose sum is σ = 29556813383552. Its totient is φ = 3725871177600.

The previous prime is 11221221021011. The next prime is 11221221021077. The reversal of 11221221021012 is 21012012212211.

11221221021012 is a `hidden beast` number, since 1 + 1 + 221 + 221 + 0 + 210 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221221021011) 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 55 ways as a sum of consecutive naturals, for example, 1280810712 + ... + 1280819472.

Almost surely, 2^{11221221021012} is an apocalyptic number.

11221221021012 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 11221221021012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14778406691776).

11221221021012 is an abundant number, since it is smaller than the sum of its proper divisors (18335592362540).

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

11221221021012 is a wasteful number, since it uses less digits than its factorization.

11221221021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10441 (or 10424 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11221221021012 its reverse (21012012212211), we get a palindrome (32233233233223).

The spelling of 11221221021012 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, twelve".