221212212110120 has 128 divisors (see below), whose sum is σ = 621063512259840. Its totient is φ = 68891464919040.

The previous prime is 221212212110077. The next prime is 221212212110213. The reversal of 221212212110120 is 21011212212122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221212212110092 and 221212212110101.

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, 26427047 + ... + 33775926.

It is an arithmetic number, because the mean of its divisors is an integer number (4852058689530).

Almost surely, 2^{221212212110120} is an apocalyptic number.

221212212110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212212110120 is an abundant number, since it is smaller than the sum of its proper divisors (399851300149720).

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

221212212110120 is a wasteful number, since it uses less digits than its factorization.

221212212110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60204195 (or 60204191 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221212212110120 its reverse (21011212212122), we get a palindrome (242223424322242).

The spelling of 221212212110120 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twelve million, one hundred ten thousand, one hundred twenty".