221656356167242 has 8 divisors (see below), whose sum is σ = 334715974078500. Its totient is φ = 110084364807744.

The previous prime is 221656356167203. The next prime is 221656356167263. The reversal of 221656356167242 is 242761653656122.

It can be written as a sum of positive squares in 2 ways, for example, as 217197708541641 + 4458647625601 = 14737629^2 + 2111551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371906637567 + ... + 371906638162.

Almost surely, 2^{221656356167242} is an apocalyptic number.

221656356167242 is a deficient number, since it is larger than the sum of its proper divisors (113059617911258).

221656356167242 is a wasteful number, since it uses less digits than its factorization.

221656356167242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743813275880.

The product of its digits is 43545600, while the sum is 58.

The spelling of 221656356167242 in words is "two hundred twenty-one trillion, six hundred fifty-six billion, three hundred fifty-six million, one hundred sixty-seven thousand, two hundred forty-two".