221020012221100 has 36 divisors (see below), whose sum is σ = 481250332476144. Its totient is φ = 88106271071680.

The previous prime is 221020012221077. The next prime is 221020012221139. The reversal of 221020012221100 is 1122210020122.

It is a happy number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3771643264 + ... + 3771701863.

It is an arithmetic number, because the mean of its divisors is an integer number (13368064791004).

Almost surely, 2^{221020012221100} is an apocalyptic number.

221020012221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020012221100 is an abundant number, since it is smaller than the sum of its proper divisors (260230320255044).

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

221020012221100 is a wasteful number, since it uses less digits than its factorization.

221020012221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7543345434 (or 7543345427 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221020012221100 its reverse (1122210020122), we get a palindrome (222142222241222).

The spelling of 221020012221100 in words is "two hundred twenty-one trillion, twenty billion, twelve million, two hundred twenty-one thousand, one hundred".