221771896 has 8 divisors (see below), whose sum is σ = 415822320. Its totient is φ = 110885944.

The previous prime is 221771873. The next prime is 221771899. The reversal of 221771896 is 698177122.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221771899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860736 + ... + 13860751.

It is an arithmetic number, because the mean of its divisors is an integer number (51977790).

Almost surely, 2^221771896 is an apocalyptic number.

It is an amenable number.

221771896 is a deficient number, since it is larger than the sum of its proper divisors (194050424).

221771896 is a wasteful number, since it uses less digits than its factorization.

221771896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27721493 (or 27721489 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 221771896 is about 14892.0077894151. The cubic root of 221771896 is about 605.2974390644.

The spelling of 221771896 in words is "two hundred twenty-one million, seven hundred seventy-one thousand, eight hundred ninety-six".