221234102281 has 2 divisors, whose sum is σ = 221234102282. Its totient is φ = 221234102280.

The previous prime is 221234102279. The next prime is 221234102311. The reversal of 221234102281 is 182201432122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196359765625 + 24874336656 = 443125^2 + 157716^2 .

It is a cyclic number.

It is not a de Polignac number, because 221234102281 - 2¹ = 221234102279 is a prime.

It is a super-3 number, since 3×221234102281³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 221234102279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221234102081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110617051140 + 110617051141.

It is an arithmetic number, because the mean of its divisors is an integer number (110617051141).

Almost surely, 2^221234102281 is an apocalyptic number.

It is an amenable number.

221234102281 is a deficient number, since it is larger than the sum of its proper divisors (1).

221234102281 is an equidigital number, since it uses as much as digits as its factorization.

221234102281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The spelling of 221234102281 in words is "two hundred twenty-one billion, two hundred thirty-four million, one hundred two thousand, two hundred eighty-one".