221211101120020 has 96 divisors (see below), whose sum is σ = 528823494823680. Its totient is φ = 76940765890560.

The previous prime is 221211101119969. The next prime is 221211101120021. The reversal of 221211101120020 is 20021101112122.

It is a junction number, because it is equal to n+sod(n) for n = 221211101119976 and 221211101120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211101120021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179364594 + ... + 180593686.

It is an arithmetic number, because the mean of its divisors is an integer number (5508578071080).

Almost surely, 2^{221211101120020} is an apocalyptic number.

221211101120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211101120020 is an abundant number, since it is smaller than the sum of its proper divisors (307612393703660).

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

221211101120020 is a wasteful number, since it uses less digits than its factorization.

221211101120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264705 (or 1264703 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221211101120020 its reverse (20021101112122), we get a palindrome (241232202232142).

The spelling of 221211101120020 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred one million, one hundred twenty thousand, twenty".