221642621648834 has 4 divisors (see below), whose sum is σ = 332463932473254. Its totient is φ = 110821310824416.

The previous prime is 221642621648827. The next prime is 221642621648857. The reversal of 221642621648834 is 438846126246122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 221241736394809 + 400885254025 = 14874197^2 + 633155^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55410655412207 + ... + 55410655412210.

Almost surely, 2^{221642621648834} is an apocalyptic number.

221642621648834 is a deficient number, since it is larger than the sum of its proper divisors (110821310824420).

221642621648834 is a wasteful number, since it uses less digits than its factorization.

221642621648834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110821310824419.

The product of its digits is 42467328, while the sum is 59.

The spelling of 221642621648834 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-four".