21311233011220 has 24 divisors (see below), whose sum is σ = 45320090457600. Its totient is φ = 8416588226592.

The previous prime is 21311233011209. The next prime is 21311233011223. The reversal of 21311233011220 is 2211033211312.

21311233011220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21311233011191 and 21311233011200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311233011223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6744059500 + ... + 6744062659.

It is an arithmetic number, because the mean of its divisors is an integer number (1888337102400).

Almost surely, 2^{21311233011220} is an apocalyptic number.

21311233011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311233011220 is an abundant number, since it is smaller than the sum of its proper divisors (24008857446380).

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

21311233011220 is a wasteful number, since it uses less digits than its factorization.

21311233011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488122247 (or 13488122245 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21311233011220 its reverse (2211033211312), we get a palindrome (23522266222532).

The spelling of 21311233011220 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirty-three million, eleven thousand, two hundred twenty".