221184981797 has 16 divisors (see below), whose sum is σ = 255273432960. Its totient is φ = 190015543872.

The previous prime is 221184981793. The next prime is 221184981799. The reversal of 221184981797 is 797189481122.

It is a cyclic number.

It is not a de Polignac number, because 221184981797 - 2² = 221184981793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221184981793) 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, 9985547 + ... + 10007672.

It is an arithmetic number, because the mean of its divisors is an integer number (15954589560).

Almost surely, 2^221184981797 is an apocalyptic number.

It is an amenable number.

221184981797 is a deficient number, since it is larger than the sum of its proper divisors (34088451163).

221184981797 is a wasteful number, since it uses less digits than its factorization.

221184981797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19993292.

The product of its digits is 4064256, while the sum is 59.

The spelling of 221184981797 in words is "two hundred twenty-one billion, one hundred eighty-four million, nine hundred eighty-one thousand, seven hundred ninety-seven".