221604547897 has 16 divisors (see below), whose sum is σ = 236392369920. Its totient is φ = 207012241152.

The previous prime is 221604547877. The next prime is 221604547903. The reversal of 221604547897 is 798745406122.

It is a de Polignac number, because none of the positive numbers 2^k-221604547897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221604547877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10535563 + ... + 10556575.

It is an arithmetic number, because the mean of its divisors is an integer number (14774523120).

Almost surely, 2^221604547897 is an apocalyptic number.

It is an amenable number.

221604547897 is a deficient number, since it is larger than the sum of its proper divisors (14787822023).

221604547897 is a wasteful number, since it uses less digits than its factorization.

221604547897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25632.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 221604547897 in words is "two hundred twenty-one billion, six hundred four million, five hundred forty-seven thousand, eight hundred ninety-seven".