221375760427784 has 8 divisors (see below), whose sum is σ = 415079550802110. Its totient is φ = 110687880213888.

The previous prime is 221375760427747. The next prime is 221375760427793. The reversal of 221375760427784 is 487724067573122.

It can be written as a sum of positive squares in only one way, i.e., 112173051427684 + 109202709000100 = 10591178^2 + 10450010^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 221375760427784.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13835985026729 + ... + 13835985026744.

Almost surely, 2^{221375760427784} is an apocalyptic number.

It is an amenable number.

221375760427784 is a deficient number, since it is larger than the sum of its proper divisors (193703790374326).

221375760427784 is a wasteful number, since it uses less digits than its factorization.

221375760427784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27671970053479 (or 27671970053475 counting only the distinct ones).

The product of its (nonzero) digits is 221276160, while the sum is 65.

The spelling of 221375760427784 in words is "two hundred twenty-one trillion, three hundred seventy-five billion, seven hundred sixty million, four hundred twenty-seven thousand, seven hundred eighty-four".