21011324443220 has 24 divisors (see below), whose sum is σ = 44394479382624. Its totient is φ = 8352968243616.

The previous prime is 21011324443159. The next prime is 21011324443223. The reversal of 21011324443220 is 2234442311012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011324443223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3222592514 + ... + 3222599033.

It is an arithmetic number, because the mean of its divisors is an integer number (1849769974276).

Almost surely, 2^{21011324443220} is an apocalyptic number.

21011324443220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011324443220 is an abundant number, since it is smaller than the sum of its proper divisors (23383154939404).

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

21011324443220 is a wasteful number, since it uses less digits than its factorization.

21011324443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445191719 (or 6445191717 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21011324443220 its reverse (2234442311012), we get a palindrome (23245766754232).

The spelling of 21011324443220 in words is "twenty-one trillion, eleven billion, three hundred twenty-four million, four hundred forty-three thousand, two hundred twenty".