221891896 has 8 divisors (see below), whose sum is σ = 416047320. Its totient is φ = 110945944.

The previous prime is 221891851. The next prime is 221891897. The reversal of 221891896 is 698198122.

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

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221891897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13868236 + ... + 13868251.

It is an arithmetic number, because the mean of its divisors is an integer number (52005915).

Almost surely, 2^221891896 is an apocalyptic number.

It is an amenable number.

221891896 is a deficient number, since it is larger than the sum of its proper divisors (194155424).

221891896 is a wasteful number, since it uses less digits than its factorization.

221891896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27736493 (or 27736489 counting only the distinct ones).

The product of its digits is 124416, while the sum is 46.

The square root of 221891896 is about 14896.0362512985. The cubic root of 221891896 is about 605.4065941572.

The spelling of 221891896 in words is "two hundred twenty-one million, eight hundred ninety-one thousand, eight hundred ninety-six".