221111102010020 has 96 divisors (see below), whose sum is σ = 497307444480000. Its totient is φ = 82327671520128.

The previous prime is 221111102010011. The next prime is 221111102010053. The reversal of 221111102010020 is 20010201111122.

It is a junction number, because it is equal to n+sod(n) for n = 221111102009977 and 221111102010004.

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, 41877461 + ... + 46860899.

It is an arithmetic number, because the mean of its divisors is an integer number (5180285880000).

Almost surely, 2^{221111102010020} is an apocalyptic number.

221111102010020 is a gapful number since it is divisible by the number (20) 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 221111102010020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248653722240000).

221111102010020 is an abundant number, since it is smaller than the sum of its proper divisors (276196342469980).

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

221111102010020 is a wasteful number, since it uses less digits than its factorization.

221111102010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985505 (or 4985503 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221111102010020 its reverse (20010201111122), we get a palindrome (241121303121142).

The spelling of 221111102010020 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred two million, ten thousand, twenty".