221079752 has 8 divisors (see below), whose sum is σ = 414524550. Its totient is φ = 110539872.

The previous prime is 221079737. The next prime is 221079757. The reversal of 221079752 is 257970122.

It can be written as a sum of positive squares in only one way, i.e., 220997956 + 81796 = 14866^2 + 286^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221079757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13817477 + ... + 13817492.

Almost surely, 2^221079752 is an apocalyptic number.

It is an amenable number.

221079752 is a deficient number, since it is larger than the sum of its proper divisors (193444798).

221079752 is a wasteful number, since it uses less digits than its factorization.

221079752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27634975 (or 27634971 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 221079752 is about 14868.7508554014. The cubic root of 221079752 is about 604.6670772641.

The spelling of 221079752 in words is "two hundred twenty-one million, seventy-nine thousand, seven hundred fifty-two".