221470897 has 8 divisors (see below), whose sum is σ = 233265600. Its totient is φ = 209690064.

The previous prime is 221470867. The next prime is 221470901. The reversal of 221470897 is 798074122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221470897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221470867) 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 7 ways as a sum of consecutive naturals, for example, 53268 + ... + 57274.

It is an arithmetic number, because the mean of its divisors is an integer number (29158200).

Almost surely, 2^221470897 is an apocalyptic number.

It is an amenable number.

221470897 is a deficient number, since it is larger than the sum of its proper divisors (11794703).

221470897 is a wasteful number, since it uses less digits than its factorization.

221470897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6935.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 221470897 is about 14881.8982996122. The cubic root of 221470897 is about 605.0234692533.

The spelling of 221470897 in words is "two hundred twenty-one million, four hundred seventy thousand, eight hundred ninety-seven".