221605502424623 has 4 divisors (see below), whose sum is σ = 221618873919048. Its totient is φ = 221592130930200.

The previous prime is 221605502424601. The next prime is 221605502424721. The reversal of 221605502424623 is 326424205506122.

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

It is a cyclic number.

It is not a de Polignac number, because 221605502424623 - 2⁸ = 221605502424367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221605502424023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6685722353 + ... + 6685755498.

It is an arithmetic number, because the mean of its divisors is an integer number (55404718479762).

Almost surely, 2^{221605502424623} is an apocalyptic number.

221605502424623 is a deficient number, since it is larger than the sum of its proper divisors (13371494425).

221605502424623 is a wasteful number, since it uses less digits than its factorization.

221605502424623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13371494424.

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 221605502424623 in words is "two hundred twenty-one trillion, six hundred five billion, five hundred two million, four hundred twenty-four thousand, six hundred twenty-three".