221200120002120 has 128 divisors (see below), whose sum is σ = 774536590540800. Its totient is φ = 49484282155776.

The previous prime is 221200120002091. The next prime is 221200120002139. The reversal of 221200120002120 is 21200021002122.

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 221200120002120.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2801380480 + ... + 2801459439.

It is an arithmetic number, because the mean of its divisors is an integer number (6051067113600).

Almost surely, 2^{221200120002120} is an apocalyptic number.

221200120002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200120002120 is an abundant number, since it is smaller than the sum of its proper divisors (553336470538680).

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

221200120002120 is a wasteful number, since it uses less digits than its factorization.

221200120002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5602839987 (or 5602839983 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221200120002120 its reverse (21200021002122), we get a palindrome (242400141004242).

The spelling of 221200120002120 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty million, two thousand, one hundred twenty".