221506355233 has 4 divisors (see below), whose sum is σ = 221516387140. Its totient is φ = 221496323328.

The previous prime is 221506355219. The next prime is 221506355243. The reversal of 221506355233 is 332553605122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 332553605122 = 2 ⋅166276802561.

It can be written as a sum of positive squares in 2 ways, for example, as 199730335744 + 21776019489 = 446912^2 + 147567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221506355233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221506355192 and 221506355201.

It is not an unprimeable number, because it can be changed into a prime (221506355243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4982760 + ... + 5027017.

It is an arithmetic number, because the mean of its divisors is an integer number (55379096785).

Almost surely, 2^221506355233 is an apocalyptic number.

It is an amenable number.

221506355233 is a deficient number, since it is larger than the sum of its proper divisors (10031907).

221506355233 is a wasteful number, since it uses less digits than its factorization.

221506355233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10031906.

The product of its (nonzero) digits is 162000, while the sum is 37.

The spelling of 221506355233 in words is "two hundred twenty-one billion, five hundred six million, three hundred fifty-five thousand, two hundred thirty-three".