221661602060 has 48 divisors (see below), whose sum is σ = 480754310400. Its totient is φ = 85759998720.

The previous prime is 221661602021. The next prime is 221661602143. The reversal of 221661602060 is 60206166122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1116662 + ... + 1300098.

It is an arithmetic number, because the mean of its divisors is an integer number (10015714800).

Almost surely, 2^221661602060 is an apocalyptic number.

221661602060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221661602060 is an abundant number, since it is smaller than the sum of its proper divisors (259092708340).

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

221661602060 is a wasteful number, since it uses less digits than its factorization.

221661602060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185426 (or 185424 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 221661602060 its reverse (60206166122), we get a palindrome (281867768182).

The spelling of 221661602060 in words is "two hundred twenty-one billion, six hundred sixty-one million, six hundred two thousand, sixty".