11231221013012 has 144 divisors (see below), whose sum is σ = 26953607955456. Its totient is φ = 3983867712000.

The previous prime is 11231221012969. The next prime is 11231221013017. The reversal of 11231221013012 is 21031012213211.

It is a super-2 number, since 2×11231221013012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231221013017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1468637 + ... + 4961787.

It is an arithmetic number, because the mean of its divisors is an integer number (187177833024).

Almost surely, 2^{11231221013012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11231221013012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13476803977728).

11231221013012 is an abundant number, since it is smaller than the sum of its proper divisors (15722386942444).

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

11231221013012 is a wasteful number, since it uses less digits than its factorization.

11231221013012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493270 (or 3493257 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 11231221013012 its reverse (21031012213211), we get a palindrome (32262233226223).

The spelling of 11231221013012 in words is "eleven trillion, two hundred thirty-one billion, two hundred twenty-one million, thirteen thousand, twelve".