21111322221312 has 36 divisors (see below), whose sum is σ = 56186904455640. Its totient is φ = 7037107406848.

The previous prime is 21111322221289. The next prime is 21111322221377. The reversal of 21111322221312 is 21312222311112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13744349637 + ... + 13744351172.

It is an arithmetic number, because the mean of its divisors is an integer number (1560747345990).

Almost surely, 2^{21111322221312} is an apocalyptic number.

It is an amenable number.

21111322221312 is an abundant number, since it is smaller than the sum of its proper divisors (35075582234328).

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

21111322221312 is an equidigital number, since it uses as much as digits as its factorization.

21111322221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27488700828 (or 27488700814 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

Adding to 21111322221312 its reverse (21312222311112), we get a palindrome (42423544532424).

The spelling of 21111322221312 in words is "twenty-one trillion, one hundred eleven billion, three hundred twenty-two million, two hundred twenty-one thousand, three hundred twelve".