221201123120020 has 24 divisors (see below), whose sum is σ = 464692451071968. Its totient is φ = 88448050672800.

The previous prime is 221201123119969. The next prime is 221201123120099. The reversal of 221201123120020 is 20021321102122.

It is a self number, because there is not a number n which added to its sum of digits gives 221201123120020.

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 7 ways as a sum of consecutive naturals, for example, 2024854966 + ... + 2024964205.

It is an arithmetic number, because the mean of its divisors is an integer number (19362185461332).

Almost surely, 2^{221201123120020} is an apocalyptic number.

221201123120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201123120020 is an abundant number, since it is smaller than the sum of its proper divisors (243491327951948).

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

221201123120020 is a wasteful number, since it uses less digits than its factorization.

221201123120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4049821911 (or 4049821909 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221201123120020 its reverse (20021321102122), we get a palindrome (241222444222142).

The spelling of 221201123120020 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred twenty-three million, one hundred twenty thousand, twenty".