21211123231120 has 20 divisors (see below), whose sum is σ = 49315861512540. Its totient is φ = 8484449292416.

The previous prime is 21211123231087. The next prime is 21211123231121. The reversal of 21211123231120 is 2113232111212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7955378198784 + 13255745032336 = 2820528^2 + 3640844^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 21211123231091 and 21211123231100.

It is not an unprimeable number, because it can be changed into a prime (21211123231121) 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, 132569520115 + ... + 132569520274.

It is an arithmetic number, because the mean of its divisors is an integer number (2465793075627).

Almost surely, 2^{21211123231120} is an apocalyptic number.

21211123231120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211123231120 is an abundant number, since it is smaller than the sum of its proper divisors (28104738281420).

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

21211123231120 is a wasteful number, since it uses less digits than its factorization.

21211123231120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265139040402 (or 265139040396 counting only the distinct ones).

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

Adding to 21211123231120 its reverse (2113232111212), we get a palindrome (23324355342332).

The spelling of 21211123231120 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred twenty".