221533661055444 has 12 divisors (see below), whose sum is σ = 516911875796064. Its totient is φ = 73844553685144.

The previous prime is 221533661055397. The next prime is 221533661055467. The reversal of 221533661055444 is 444550166335122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 9230569210632 + ... + 9230569210655.

It is an arithmetic number, because the mean of its divisors is an integer number (43075989649672).

Almost surely, 2^{221533661055444} is an apocalyptic number.

It is an amenable number.

221533661055444 is an abundant number, since it is smaller than the sum of its proper divisors (295378214740620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221533661055444 is a wasteful number, since it uses less digits than its factorization.

221533661055444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18461138421294 (or 18461138421292 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 51.

The spelling of 221533661055444 in words is "two hundred twenty-one trillion, five hundred thirty-three billion, six hundred sixty-one million, fifty-five thousand, four hundred forty-four".