221642621648835 has 16 divisors (see below), whose sum is σ = 354859826415360. Its totient is φ = 118132187620320.

The previous prime is 221642621648827. The next prime is 221642621648857. The reversal of 221642621648835 is 538846126246122.

It is a happy number.

It is not a de Polignac number, because 221642621648835 - 2³ = 221642621648827 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4825638295 + ... + 4825684224.

It is an arithmetic number, because the mean of its divisors is an integer number (22178739150960).

Almost surely, 2^{221642621648835} is an apocalyptic number.

221642621648835 is a deficient number, since it is larger than the sum of its proper divisors (133217204766525).

221642621648835 is a wasteful number, since it uses less digits than its factorization.

221642621648835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9651324058.

The product of its digits is 53084160, while the sum is 60.

The spelling of 221642621648835 in words is "two hundred twenty-one trillion, six hundred forty-two billion, six hundred twenty-one million, six hundred forty-eight thousand, eight hundred thirty-five".