221413685906 has 16 divisors (see below), whose sum is σ = 379586459520. Its totient is φ = 94886544480.

The previous prime is 221413685903. The next prime is 221413685917. The reversal of 221413685906 is 609586314122.

221413685906 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221413685903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139910 + ... + 680001.

It is an arithmetic number, because the mean of its divisors is an integer number (23724153720).

Almost surely, 2^221413685906 is an apocalyptic number.

221413685906 is a deficient number, since it is larger than the sum of its proper divisors (158172773614).

221413685906 is a wasteful number, since it uses less digits than its factorization.

221413685906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839209.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 221413685906 in words is "two hundred twenty-one billion, four hundred thirteen million, six hundred eighty-five thousand, nine hundred six".