388111400221 has 2 divisors, whose sum is σ = 388111400222. Its totient is φ = 388111400220.

The previous prime is 388111400213. The next prime is 388111400251. The reversal of 388111400221 is 122004111883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382925816100 + 5185584121 = 618810^2 + 72011^2 .

It is a cyclic number.

It is not a de Polignac number, because 388111400221 - 2³ = 388111400213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388111400251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194055700110 + 194055700111.

It is an arithmetic number, because the mean of its divisors is an integer number (194055700111).

Almost surely, 2^388111400221 is an apocalyptic number.

It is an amenable number.

388111400221 is a deficient number, since it is larger than the sum of its proper divisors (1).

388111400221 is an equidigital number, since it uses as much as digits as its factorization.

388111400221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The spelling of 388111400221 in words is "three hundred eighty-eight billion, one hundred eleven million, four hundred thousand, two hundred twenty-one".