221605161102 has 24 divisors (see below), whose sum is σ = 517078709784. Its totient is φ = 68186203344.

The previous prime is 221605161031. The next prime is 221605161103. The reversal of 221605161102 is 201161506122.

221605161102 is a `hidden beast` number, since 22 + 16 + 0 + 516 + 110 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221605161103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 473515068 + ... + 473515535.

It is an arithmetic number, because the mean of its divisors is an integer number (21544946241).

Almost surely, 2^221605161102 is an apocalyptic number.

221605161102 is an abundant number, since it is smaller than the sum of its proper divisors (295473548682).

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

221605161102 is a wasteful number, since it uses less digits than its factorization.

221605161102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947030624 (or 947030621 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 221605161102 its reverse (201161506122), we get a palindrome (422766667224).

The spelling of 221605161102 in words is "two hundred twenty-one billion, six hundred five million, one hundred sixty-one thousand, one hundred two".