221157606 has 64 divisors (see below), whose sum is σ = 479001600. Its totient is φ = 67860000.

The previous prime is 221157589. The next prime is 221157617. The reversal of 221157606 is 606751122.

221157606 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 880981 + ... + 881231.

It is an arithmetic number, because the mean of its divisors is an integer number (7484400).

Almost surely, 2^221157606 is an apocalyptic number.

221157606 is an abundant number, since it is smaller than the sum of its proper divisors (257843994).

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

221157606 is a wasteful number, since it uses less digits than its factorization.

221157606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 221157606 is about 14871.3686659971. The cubic root of 221157606 is about 604.7380474688.

The spelling of 221157606 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, six hundred six".