221211110020 has 48 divisors (see below), whose sum is σ = 466888086000. Its totient is φ = 88038351360.

The previous prime is 221211109993. The next prime is 221211110069. The reversal of 221211110020 is 20011112122.

221211110020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 9581668996 + 211629441024 = 97886^2 + 460032^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7078830 + ... + 7110010.

It is an arithmetic number, because the mean of its divisors is an integer number (9726835125).

Almost surely, 2^221211110020 is an apocalyptic number.

221211110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211110020 is an abundant number, since it is smaller than the sum of its proper divisors (245676975980).

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

221211110020 is a wasteful number, since it uses less digits than its factorization.

221211110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32968 (or 32966 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221211110020 its reverse (20011112122), we get a palindrome (241222222142).

The spelling of 221211110020 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred ten thousand, twenty".