221392955 has 32 divisors (see below), whose sum is σ = 325430784. Its totient is φ = 141129216.

The previous prime is 221392891. The next prime is 221392961. The reversal of 221392955 is 559293122.

It is not a de Polignac number, because 221392955 - 2⁶ = 221392891 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 47144 + ... + 51626.

It is an arithmetic number, because the mean of its divisors is an integer number (10169712).

Almost surely, 2^221392955 is an apocalyptic number.

221392955 is a deficient number, since it is larger than the sum of its proper divisors (104037829).

221392955 is a wasteful number, since it uses less digits than its factorization.

221392955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595.

The product of its digits is 48600, while the sum is 38.

The square root of 221392955 is about 14879.2793844326. The cubic root of 221392955 is about 604.9524858526.

The spelling of 221392955 in words is "two hundred twenty-one million, three hundred ninety-two thousand, nine hundred fifty-five".