18221198899933 has 2 divisors, whose sum is σ = 18221198899934. Its totient is φ = 18221198899932.

The previous prime is 18221198899877. The next prime is 18221198900011. The reversal of 18221198899933 is 33999889112281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16454072675044 + 1767126224889 = 4056362^2 + 1329333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18221198899933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18221198899433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110599449966 + 9110599449967.

It is an arithmetic number, because the mean of its divisors is an integer number (9110599449967).

Almost surely, 2^{18221198899933} is an apocalyptic number.

It is an amenable number.

18221198899933 is a deficient number, since it is larger than the sum of its proper divisors (1).

18221198899933 is an equidigital number, since it uses as much as digits as its factorization.

18221198899933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120932352, while the sum is 73.

The spelling of 18221198899933 in words is "eighteen trillion, two hundred twenty-one billion, one hundred ninety-eight million, eight hundred ninety-nine thousand, nine hundred thirty-three".