221212200100020 has 96 divisors (see below), whose sum is σ = 622895571244800. Its totient is φ = 58656822681600.

The previous prime is 221212200100009. The next prime is 221212200100037. The reversal of 221212200100020 is 20001002212122.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 31 ways as a sum of consecutive naturals, for example, 13329874 + ... + 24902006.

It is an arithmetic number, because the mean of its divisors is an integer number (6488495533800).

Almost surely, 2^{221212200100020} is an apocalyptic number.

221212200100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212200100020 is an abundant number, since it is smaller than the sum of its proper divisors (401683371144780).

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

221212200100020 is a wasteful number, since it uses less digits than its factorization.

221212200100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11573945 (or 11573943 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221212200100020 its reverse (20001002212122), we get a palindrome (241213202312142).

The spelling of 221212200100020 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred million, one hundred thousand, twenty".