221010211028 has 6 divisors (see below), whose sum is σ = 386767869306. Its totient is φ = 110505105512.

The previous prime is 221010211021. The next prime is 221010211031. The reversal of 221010211028 is 820112010122.

221010211028 is digitally balanced in base 2, 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 only one way, i.e., 156413922064 + 64596288964 = 395492^2 + 254158^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010211021) by changing a digit.

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 as a sum of consecutive naturals, namely, 27626276375 + ... + 27626276382.

It is an arithmetic number, because the mean of its divisors is an integer number (64461311551).

Almost surely, 2^221010211028 is an apocalyptic number.

It is an amenable number.

221010211028 is a deficient number, since it is larger than the sum of its proper divisors (165757658278).

221010211028 is a wasteful number, since it uses less digits than its factorization.

221010211028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55252552761 (or 55252552759 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 221010211028 in words is "two hundred twenty-one billion, ten million, two hundred eleven thousand, twenty-eight".