221751266012741 has 4 divisors (see below), whose sum is σ = 224788954588332. Its totient is φ = 218713577437152.

The previous prime is 221751266012729. The next prime is 221751266012743. The reversal of 221751266012741 is 147210662157122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48603959495716 + 173147306517025 = 6971654^2 + 13158545^2 .

It is a cyclic number.

It is not a de Polignac number, because 221751266012741 - 2⁶ = 221751266012677 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 (221751266012743) 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, 1518844287686 + ... + 1518844287831.

It is an arithmetic number, because the mean of its divisors is an integer number (56197238647083).

Almost surely, 2^{221751266012741} is an apocalyptic number.

It is an amenable number.

221751266012741 is a deficient number, since it is larger than the sum of its proper divisors (3037688575591).

221751266012741 is an equidigital number, since it uses as much as digits as its factorization.

221751266012741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3037688575590.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 221751266012741 in words is "two hundred twenty-one trillion, seven hundred fifty-one billion, two hundred sixty-six million, twelve thousand, seven hundred forty-one".