221533661055442 has 8 divisors (see below), whose sum is σ = 333434622954636. Its totient is φ = 110388786737232.

The previous prime is 221533661055397. The next prime is 221533661055467. The reversal of 221533661055442 is 244550166335122.

It can be written as a sum of positive squares in 2 ways, for example, as 168424824223881 + 53108836831561 = 12977859^2 + 7287581^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189021894513 + ... + 189021895684.

Almost surely, 2^{221533661055442} is an apocalyptic number.

221533661055442 is a deficient number, since it is larger than the sum of its proper divisors (111900961899194).

221533661055442 is a wasteful number, since it uses less digits than its factorization.

221533661055442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378043790492.

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 221533661055442 in words is "two hundred twenty-one trillion, five hundred thirty-three billion, six hundred sixty-one million, fifty-five thousand, four hundred forty-two".