21112120221331 has 4 divisors (see below), whose sum is σ = 21124205008552. Its totient is φ = 21100035434112.

The previous prime is 21112120221329. The next prime is 21112120221343. The reversal of 21112120221331 is 13312202121112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21112120221331 - 2¹ = 21112120221329 is a prime.

It is a super-2 number, since 2×21112120221331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112120231331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6042390990 + ... + 6042394483.

It is an arithmetic number, because the mean of its divisors is an integer number (5281051252138).

Almost surely, 2^{21112120221331} is an apocalyptic number.

21112120221331 is a deficient number, since it is larger than the sum of its proper divisors (12084787221).

21112120221331 is a wasteful number, since it uses less digits than its factorization.

21112120221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12084787220.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21112120221331 its reverse (13312202121112), we get a palindrome (34424322342443).

The spelling of 21112120221331 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty million, two hundred twenty-one thousand, three hundred thirty-one".