17827228421 has 2 divisors, whose sum is σ = 17827228422. Its totient is φ = 17827228420.

The previous prime is 17827228303. The next prime is 17827228469. The reversal of 17827228421 is 12482272871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12492532900 + 5334695521 = 111770^2 + 73039^2 .

It is an emirp because it is prime and its reverse (12482272871) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17827228421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17827228481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8913614210 + 8913614211.

It is an arithmetic number, because the mean of its divisors is an integer number (8913614211).

Almost surely, 2^17827228421 is an apocalyptic number.

It is an amenable number.

17827228421 is a deficient number, since it is larger than the sum of its proper divisors (1).

17827228421 is an equidigital number, since it uses as much as digits as its factorization.

17827228421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 200704, while the sum is 44.

The spelling of 17827228421 in words is "seventeen billion, eight hundred twenty-seven million, two hundred twenty-eight thousand, four hundred twenty-one".