21210131221120 has 96 divisors (see below), whose sum is σ = 52112928537180. Its totient is φ = 8254753431552.

The previous prime is 21210131221099. The next prime is 21210131221127. The reversal of 21210131221120 is 2112213101212.

It can be written as a sum of positive squares in 6 ways, for example, as 17320179709504 + 3889951511616 = 4161752^2 + 1972296^2 .

It is not an unprimeable number, because it can be changed into a prime (21210131221127) 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 11 ways as a sum of consecutive naturals, for example, 11227869 + ... + 12980188.

Almost surely, 2^{21210131221120} is an apocalyptic number.

21210131221120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210131221120 is an abundant number, since it is smaller than the sum of its proper divisors (30902797316060).

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

21210131221120 is an equidigital number, since it uses as much as digits as its factorization.

21210131221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24208150 (or 24208101 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21210131221120 its reverse (2112213101212), we get a palindrome (23322344322332).

The spelling of 21210131221120 in words is "twenty-one trillion, two hundred ten billion, one hundred thirty-one million, two hundred twenty-one thousand, one hundred twenty".