221214405 has 8 divisors (see below), whose sum is σ = 353943072. Its totient is φ = 117981008.

The previous prime is 221214401. The next prime is 221214431. The reversal of 221214405 is 504412122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221214405 - 2² = 221214401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221214401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7373799 + ... + 7373828.

It is an arithmetic number, because the mean of its divisors is an integer number (44242884).

Almost surely, 2^221214405 is an apocalyptic number.

It is an amenable number.

221214405 is a deficient number, since it is larger than the sum of its proper divisors (132728667).

221214405 is a wasteful number, since it uses less digits than its factorization.

221214405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14747635.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221214405 is about 14873.2782196797. The cubic root of 221214405 is about 604.7898138340.

Adding to 221214405 its reverse (504412122), we get a palindrome (725626527).

The spelling of 221214405 in words is "two hundred twenty-one million, two hundred fourteen thousand, four hundred five".