221098448977 has 16 divisors (see below), whose sum is σ = 259120616832. Its totient is φ = 184695223680.

The previous prime is 221098448971. The next prime is 221098448981. The reversal of 221098448977 is 779844890122.

It is a cyclic number.

It is not a de Polignac number, because 221098448977 - 2³ = 221098448969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221098448971) 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, 134958 + ... + 678535.

It is an arithmetic number, because the mean of its divisors is an integer number (16195038552).

Almost surely, 2^221098448977 is an apocalyptic number.

It is an amenable number.

221098448977 is a deficient number, since it is larger than the sum of its proper divisors (38022167855).

221098448977 is an equidigital number, since it uses as much as digits as its factorization.

221098448977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814488.

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 221098448977 in words is "two hundred twenty-one billion, ninety-eight million, four hundred forty-eight thousand, nine hundred seventy-seven".