218321401 has 2 divisors, whose sum is σ = 218321402. Its totient is φ = 218321400.

The previous prime is 218321393. The next prime is 218321431. The reversal of 218321401 is 104123812.

It is a happy number.

218321401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216796176 + 1525225 = 14724^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 218321401 - 2³ = 218321393 is a prime.

It is not a weakly prime, because it can be changed into another prime (218321431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109160700 + 109160701.

It is an arithmetic number, because the mean of its divisors is an integer number (109160701).

Almost surely, 2^218321401 is an apocalyptic number.

It is an amenable number.

218321401 is a deficient number, since it is larger than the sum of its proper divisors (1).

218321401 is an equidigital number, since it uses as much as digits as its factorization.

218321401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 218321401 is about 14775.7030627987. The cubic root of 218321401 is about 602.1417908266.

The spelling of 218321401 in words is "two hundred eighteen million, three hundred twenty-one thousand, four hundred one".