21331211222011 has 4 divisors (see below), whose sum is σ = 21333419203024. Its totient is φ = 21329003241000.

The previous prime is 21331211221913. The next prime is 21331211222021. The reversal of 21331211222011 is 11022211213312.

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 21331211222011 - 2¹¹ = 21331211219963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331211222021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103976015 + ... + 1103995336.

It is an arithmetic number, because the mean of its divisors is an integer number (5333354800756).

Almost surely, 2^{21331211222011} is an apocalyptic number.

21331211222011 is a deficient number, since it is larger than the sum of its proper divisors (2207981013).

21331211222011 is an equidigital number, since it uses as much as digits as its factorization.

21331211222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207981012.

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

Adding to 21331211222011 its reverse (11022211213312), we get a palindrome (32353422435323).

The spelling of 21331211222011 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred eleven million, two hundred twenty-two thousand, eleven".