9180213221 has 2 divisors, whose sum is σ = 9180213222. Its totient is φ = 9180213220.

The previous prime is 9180213193. The next prime is 9180213269. The reversal of 9180213221 is 1223120819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6760950625 + 2419262596 = 82225^2 + 49186^2 .

It is an emirp because it is prime and its reverse (1223120819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9180213221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9180213121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4590106610 + 4590106611.

It is an arithmetic number, because the mean of its divisors is an integer number (4590106611).

Almost surely, 2^9180213221 is an apocalyptic number.

It is an amenable number.

9180213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9180213221 is an equidigital number, since it uses as much as digits as its factorization.

9180213221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 9180213221 is about 95813.4292309799. The cubic root of 9180213221 is about 2093.8758250888.

The spelling of 9180213221 in words is "nine billion, one hundred eighty million, two hundred thirteen thousand, two hundred twenty-one".