221647126730441 has 4 divisors (see below), whose sum is σ = 221647174206852. Its totient is φ = 221647079254032.

The previous prime is 221647126730399. The next prime is 221647126730443. The reversal of 221647126730441 is 144037621746122.

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 217181998513216 + 4465128217225 = 14737096^2 + 2113085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221647126730441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221647126730441.

It is not an unprimeable number, because it can be changed into a prime (221647126730443) 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, 15864890 + ... + 26362643.

It is an arithmetic number, because the mean of its divisors is an integer number (55411793551713).

Almost surely, 2^{221647126730441} is an apocalyptic number.

It is an amenable number.

221647126730441 is a deficient number, since it is larger than the sum of its proper divisors (47476411).

221647126730441 is an equidigital number, since it uses as much as digits as its factorization.

221647126730441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47476410.

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 221647126730441 in words is "two hundred twenty-one trillion, six hundred forty-seven billion, one hundred twenty-six million, seven hundred thirty thousand, four hundred forty-one".