221454997 has 4 divisors (see below), whose sum is σ = 221591916. Its totient is φ = 221318080.

The previous prime is 221454983. The next prime is 221455001. The reversal of 221454997 is 799454122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81884401 + 139570596 = 9049^2 + 11814^2 .

It is a cyclic number.

It is not a de Polignac number, because 221454997 - 2¹¹ = 221452949 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 (221454397) 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 3 ways as a sum of consecutive naturals, for example, 66004 + ... + 69277.

It is an arithmetic number, because the mean of its divisors is an integer number (55397979).

Almost surely, 2^221454997 is an apocalyptic number.

It is an amenable number.

221454997 is a deficient number, since it is larger than the sum of its proper divisors (136919).

221454997 is a wasteful number, since it uses less digits than its factorization.

221454997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136918.

The product of its digits is 181440, while the sum is 43.

The square root of 221454997 is about 14881.3640839810. The cubic root of 221454997 is about 605.0089901448.

The spelling of 221454997 in words is "two hundred twenty-one million, four hundred fifty-four thousand, nine hundred ninety-seven".