221213055688 has 8 divisors (see below), whose sum is σ = 414774479430. Its totient is φ = 110606527840.

The previous prime is 221213055677. The next prime is 221213055691. The reversal of 221213055688 is 886550312122.

It can be written as a sum of positive squares in only one way, i.e., 160943787684 + 60269268004 = 401178^2 + 245498^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13825815973 + ... + 13825815988.

Almost surely, 2^221213055688 is an apocalyptic number.

It is an amenable number.

221213055688 is a deficient number, since it is larger than the sum of its proper divisors (193561423742).

221213055688 is a wasteful number, since it uses less digits than its factorization.

221213055688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27651631967 (or 27651631963 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 221213055688 in words is "two hundred twenty-one billion, two hundred thirteen million, fifty-five thousand, six hundred eighty-eight".