211100221020 has 96 divisors (see below), whose sum is σ = 673992422208. Its totient is φ = 48906473472.

The previous prime is 211100221009. The next prime is 211100221049. The reversal of 211100221020 is 20122001112.

211100221020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 211100220987 and 211100221005.

It is a congruent number.

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, 7946779 + ... + 7973298.

It is an arithmetic number, because the mean of its divisors is an integer number (7020754398).

Almost surely, 2^211100221020 is an apocalyptic number.

211100221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211100221020 is an abundant number, since it is smaller than the sum of its proper divisors (462892201188).

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

211100221020 is a wasteful number, since it uses less digits than its factorization.

211100221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15920119 (or 15920117 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 211100221020 its reverse (20122001112), we get a palindrome (231222222132).

The spelling of 211100221020 in words is "two hundred eleven billion, one hundred million, two hundred twenty-one thousand, twenty".