221533654665441 has 8 divisors (see below), whose sum is σ = 298423342367584. Its totient is φ = 146166535036800.

The previous prime is 221533654665439. The next prime is 221533654665493. The reversal of 221533654665441 is 144566456335122.

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

It is not a de Polignac number, because 221533654665441 - 2¹ = 221533654665439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221533654665041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380642018035 + ... + 380642018616.

It is an arithmetic number, because the mean of its divisors is an integer number (37302917795948).

Almost surely, 2^{221533654665441} is an apocalyptic number.

It is an amenable number.

221533654665441 is a deficient number, since it is larger than the sum of its proper divisors (76889687702143).

221533654665441 is an equidigital number, since it uses as much as digits as its factorization.

221533654665441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761284036751.

The product of its digits is 62208000, while the sum is 57.

The spelling of 221533654665441 in words is "two hundred twenty-one trillion, five hundred thirty-three billion, six hundred fifty-four million, six hundred sixty-five thousand, four hundred forty-one".