21331222011 has 72 divisors (see below), whose sum is σ = 34620112800. Its totient is φ = 12642389760.

The previous prime is 21331221983. The next prime is 21331222057. The reversal of 21331222011 is 11022213312.

It is not a de Polignac number, because 21331222011 - 2⁷ = 21331221883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331222061) 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 71 ways as a sum of consecutive naturals, for example, 34572175 + ... + 34572791.

It is an arithmetic number, because the mean of its divisors is an integer number (480834900).

Almost surely, 2^21331222011 is an apocalyptic number.

21331222011 is a deficient number, since it is larger than the sum of its proper divisors (13288890789).

21331222011 is a wasteful number, since it uses less digits than its factorization.

21331222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297 (or 1283 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21331222011 its reverse (11022213312), we get a palindrome (32353435323).

It can be divided in two parts, 21331 and 222011, that added together give a palindrome (243342).

The spelling of 21331222011 in words is "twenty-one billion, three hundred thirty-one million, two hundred twenty-two thousand, eleven".