21212201000120 has 256 divisors, whose sum is σ = 52684515072000. Its totient is φ = 7639293505536.

The previous prime is 21212201000099. The next prime is 21212201000131. The reversal of 21212201000120 is 2100010221212.

It is a junction number, because it is equal to n+sod(n) for n = 21212201000095 and 21212201000104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1183509479 + ... + 1183527401.

It is an arithmetic number, because the mean of its divisors is an integer number (205798887000).

Almost surely, 2^{21212201000120} is an apocalyptic number.

21212201000120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212201000120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26342257536000).

21212201000120 is an abundant number, since it is smaller than the sum of its proper divisors (31472314071880).

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

21212201000120 is a wasteful number, since it uses less digits than its factorization.

21212201000120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18382 (or 18378 counting only the distinct ones).

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

Adding to 21212201000120 its reverse (2100010221212), we get a palindrome (23312211221332).

The spelling of 21212201000120 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, one hundred twenty", and thus it is an aban number.