221423302181 has 2 divisors, whose sum is σ = 221423302182. Its totient is φ = 221423302180.

The previous prime is 221423302169. The next prime is 221423302291. The reversal of 221423302181 is 181203324122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165238185025 + 56185117156 = 406495^2 + 237034^2 .

It is a cyclic number.

It is not a de Polignac number, because 221423302181 - 2¹⁰ = 221423301157 is a prime.

It is a super-2 number, since 2×221423302181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221423302781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711651090 + 110711651091.

It is an arithmetic number, because the mean of its divisors is an integer number (110711651091).

Almost surely, 2^221423302181 is an apocalyptic number.

It is an amenable number.

221423302181 is a deficient number, since it is larger than the sum of its proper divisors (1).

221423302181 is an equidigital number, since it uses as much as digits as its factorization.

221423302181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 221423302181 in words is "two hundred twenty-one billion, four hundred twenty-three million, three hundred two thousand, one hundred eighty-one".