221021021108 has 24 divisors (see below), whose sum is σ = 394469413800. Its totient is φ = 108327841920.

The previous prime is 221021021083. The next prime is 221021021113. The reversal of 221021021108 is 801120120122.

It can be written as a sum of positive squares in 4 ways, for example, as 24344736784 + 196676284324 = 156028^2 + 443482^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221021021108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1474283 + ... + 1617266.

It is an arithmetic number, because the mean of its divisors is an integer number (16436225575).

Almost surely, 2^221021021108 is an apocalyptic number.

It is an amenable number.

221021021108 is a deficient number, since it is larger than the sum of its proper divisors (173448392692).

221021021108 is a wasteful number, since it uses less digits than its factorization.

221021021108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091907 (or 3091905 counting only the distinct ones).

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

The spelling of 221021021108 in words is "two hundred twenty-one billion, twenty-one million, twenty-one thousand, one hundred eight".