221880387777 has 16 divisors (see below), whose sum is σ = 297362889600. Its totient is φ = 147159251712.

The previous prime is 221880387767. The next prime is 221880387779. The reversal of 221880387777 is 777783088122.

It is not a de Polignac number, because 221880387777 - 2⁴ = 221880387761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221880387777.

It is not an unprimeable number, because it can be changed into a prime (221880387779) 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, 6584223 + ... + 6617835.

It is an arithmetic number, because the mean of its divisors is an integer number (18585180600).

Almost surely, 2^221880387777 is an apocalyptic number.

It is an amenable number.

221880387777 is a deficient number, since it is larger than the sum of its proper divisors (75482501823).

221880387777 is a wasteful number, since it uses less digits than its factorization.

221880387777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44872.

The product of its (nonzero) digits is 14751744, while the sum is 60.

The spelling of 221880387777 in words is "two hundred twenty-one billion, eight hundred eighty million, three hundred eighty-seven thousand, seven hundred seventy-seven".