221002102170 has 72 divisors (see below), whose sum is σ = 593739282708. Its totient is φ = 57032778240.

The previous prime is 221002102163. The next prime is 221002102171. The reversal of 221002102170 is 71201200122.

It is a happy number.

221002102170 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 211665325041 + 9336777129 = 460071^2 + 96627^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221002102171) 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 in 35 ways as a sum of consecutive naturals, for example, 1191127 + ... + 1364106.

Almost surely, 2^221002102170 is an apocalyptic number.

221002102170 is an abundant number, since it is smaller than the sum of its proper divisors (372737180538).

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

221002102170 is a wasteful number, since it uses less digits than its factorization.

221002102170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555308 (or 2555274 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

Adding to 221002102170 its reverse (71201200122), we get a palindrome (292203302292).

The spelling of 221002102170 in words is "two hundred twenty-one billion, two million, one hundred two thousand, one hundred seventy".