120001211111220 has 384 divisors, whose sum is σ = 359176507200000. Its totient is φ = 29850235084800.

The previous prime is 120001211111161. The next prime is 120001211111227. The reversal of 120001211111220 is 22111112100021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 120001211111220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120001211111227) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10255631370 + ... + 10255643070.

It is an arithmetic number, because the mean of its divisors is an integer number (935355487500).

Almost surely, 2^{120001211111220} is an apocalyptic number.

120001211111220 is a gapful number since it is divisible by the number (10) 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 120001211111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179588253600000).

120001211111220 is an abundant number, since it is smaller than the sum of its proper divisors (239175296088780).

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

120001211111220 is a wasteful number, since it uses less digits than its factorization.

120001211111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12403 (or 12401 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 120001211111220 its reverse (22111112100021), we get a palindrome (142112323211241).

The spelling of 120001211111220 in words is "one hundred twenty trillion, one billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty".