221123504405 has 64 divisors (see below), whose sum is σ = 292482731520. Its totient is φ = 159804825600.

The previous prime is 221123504351. The next prime is 221123504417. The reversal of 221123504405 is 504405321122.

It is not a de Polignac number, because 221123504405 - 2²⁴ = 221106727189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 216999986 + ... + 217001004.

It is an arithmetic number, because the mean of its divisors is an integer number (4570042680).

Almost surely, 2^221123504405 is an apocalyptic number.

It is an amenable number.

221123504405 is a deficient number, since it is larger than the sum of its proper divisors (71359227115).

221123504405 is a wasteful number, since it uses less digits than its factorization.

221123504405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 221123504405 its reverse (504405321122), we get a palindrome (725528825527).

The spelling of 221123504405 in words is "two hundred twenty-one billion, one hundred twenty-three million, five hundred four thousand, four hundred five".