221506355232 has 54 divisors (see below), whose sum is σ = 629931411837. Its totient is φ = 73832789376.

The previous prime is 221506355219. The next prime is 221506355243. The reversal of 221506355232 is 232553605122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

221506355232 is a `hidden beast` number, since 2 + 2 + 15 + 0 + 63 + 552 + 32 = 666.

221506355232 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 200377988496 + 21128366736 = 447636^2 + 145356^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332796.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7973238 + ... + 8000970.

Almost surely, 2^221506355232 is an apocalyptic number.

It is an amenable number.

221506355232 is an abundant number, since it is smaller than the sum of its proper divisors (408425056605).

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

221506355232 is an frugal number, since it uses more digits than its factorization.

221506355232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55482 (or 27738 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 221506355232 in words is "two hundred twenty-one billion, five hundred six million, three hundred fifty-five thousand, two hundred thirty-two".