221607897 has 8 divisors (see below), whose sum is σ = 337688256. Its totient is φ = 126633072.

The previous prime is 221607863. The next prime is 221607901. The reversal of 221607897 is 798706122.

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

It is not a de Polignac number, because 221607897 - 2⁶ = 221607833 is a prime.

It is a super-2 number, since 2×221607897² = 98220120025525218, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (221607817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5276358 + ... + 5276399.

It is an arithmetic number, because the mean of its divisors is an integer number (42211032).

Almost surely, 2^221607897 is an apocalyptic number.

It is an amenable number.

221607897 is a deficient number, since it is larger than the sum of its proper divisors (116080359).

221607897 is a wasteful number, since it uses less digits than its factorization.

221607897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10552767.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 221607897 is about 14886.5004954153. The cubic root of 221607897 is about 605.1481976502.

The spelling of 221607897 in words is "two hundred twenty-one million, six hundred seven thousand, eight hundred ninety-seven".