221545010465221 has 4 divisors (see below), whose sum is σ = 221545103223744. Its totient is φ = 221544917706700.

The previous prime is 221545010465171. The next prime is 221545010465551. The reversal of 221545010465221 is 122564010545122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221545010465221 - 2⁴⁷ = 80807522109893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221545010465021) 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, 42699325 + ... + 47605906.

It is an arithmetic number, because the mean of its divisors is an integer number (55386275805936).

Almost surely, 2^{221545010465221} is an apocalyptic number.

It is an amenable number.

221545010465221 is a deficient number, since it is larger than the sum of its proper divisors (92758523).

221545010465221 is an equidigital number, since it uses as much as digits as its factorization.

221545010465221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92758522.

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 221545010465221 in words is "two hundred twenty-one trillion, five hundred forty-five billion, ten million, four hundred sixty-five thousand, two hundred twenty-one".