18213101 has 2 divisors, whose sum is σ = 18213102. Its totient is φ = 18213100.

The previous prime is 18213067. The next prime is 18213113. The reversal of 18213101 is 10131281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17859076 + 354025 = 4226^2 + 595^2 .

It is an emirp because it is prime and its reverse (10131281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18213101 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18213101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18213161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106550 + 9106551.

It is an arithmetic number, because the mean of its divisors is an integer number (9106551).

Almost surely, 2^18213101 is an apocalyptic number.

It is an amenable number.

18213101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213101 is an equidigital number, since it uses as much as digits as its factorization.

18213101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 18213101 is about 4267.6809862032. The cubic root of 18213101 is about 263.1043117283.

Adding to 18213101 its reverse (10131281), we get a palindrome (28344382).

The spelling of 18213101 in words is "eighteen million, two hundred thirteen thousand, one hundred one".