221435663643 has 12 divisors (see below), whose sum is σ = 320096253048. Its totient is φ = 147510819360.

The previous prime is 221435663629. The next prime is 221435663663. The reversal of 221435663643 is 346366534122.

221435663643 is a `hidden beast` number, since 2 + 2 + 1 + 4 + 3 + 5 + 6 + 636 + 4 + 3 = 666.

It is not a de Polignac number, because 221435663643 - 2¹⁶ = 221435598107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221435663663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9400618 + ... + 9424143.

It is an arithmetic number, because the mean of its divisors is an integer number (26674687754).

Almost surely, 2^221435663643 is an apocalyptic number.

221435663643 is a deficient number, since it is larger than the sum of its proper divisors (98660589405).

221435663643 is a wasteful number, since it uses less digits than its factorization.

221435663643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18826074 (or 18826071 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 45.

The spelling of 221435663643 in words is "two hundred twenty-one billion, four hundred thirty-five million, six hundred sixty-three thousand, six hundred forty-three".