21212120000120 has 32 divisors (see below), whose sum is σ = 54545451429600. Its totient is φ = 7272726857088.

The previous prime is 21212120000101. The next prime is 21212120000129. The reversal of 21212120000120 is 2100002121212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21212120000095 and 21212120000104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212120000129) 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, 37878785435 + ... + 37878785994.

It is an arithmetic number, because the mean of its divisors is an integer number (1704545357175).

Almost surely, 2^{21212120000120} is an apocalyptic number.

21212120000120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212120000120 is an abundant number, since it is smaller than the sum of its proper divisors (33333331429480).

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

21212120000120 is a wasteful number, since it uses less digits than its factorization.

21212120000120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75757571447 (or 75757571443 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21212120000120 its reverse (2100002121212), we get a palindrome (23312122121332).

The spelling of 21212120000120 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty", and thus it is an aban number.