221054405 has 16 divisors (see below), whose sum is σ = 311641344. Its totient is φ = 148399680.

The previous prime is 221054401. The next prime is 221054419. The reversal of 221054405 is 504450122.

It is a happy number.

It is not a de Polignac number, because 221054405 - 2² = 221054401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221054401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153869 + ... + 155298.

It is an arithmetic number, because the mean of its divisors is an integer number (19477584).

Almost surely, 2^221054405 is an apocalyptic number.

It is an amenable number.

221054405 is a deficient number, since it is larger than the sum of its proper divisors (90586939).

221054405 is a wasteful number, since it uses less digits than its factorization.

221054405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309196.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 221054405 is about 14867.8984728845. The cubic root of 221054405 is about 604.6439678325.

The spelling of 221054405 in words is "two hundred twenty-one million, fifty-four thousand, four hundred five".