221373633609 has 16 divisors (see below), whose sum is σ = 327972274240. Its totient is φ = 147577321440.

The previous prime is 221373633581. The next prime is 221373633629. The reversal of 221373633609 is 906336373122.

221373633609 is a `hidden beast` number, since 2 + 2 + 1 + 3 + 7 + 3 + 6 + 33 + 609 = 666.

It is not a de Polignac number, because 221373633609 - 2¹¹ = 221373631561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221373633629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 757749 + ... + 1008429.

It is an arithmetic number, because the mean of its divisors is an integer number (20498267140).

Almost surely, 2^221373633609 is an apocalyptic number.

It is an amenable number.

221373633609 is a deficient number, since it is larger than the sum of its proper divisors (106598640631).

221373633609 is a wasteful number, since it uses less digits than its factorization.

221373633609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283397 (or 283391 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 45.

The spelling of 221373633609 in words is "two hundred twenty-one billion, three hundred seventy-three million, six hundred thirty-three thousand, six hundred nine".