398690021101 has 2 divisors, whose sum is σ = 398690021102. Its totient is φ = 398690021100.

The previous prime is 398690021029. The next prime is 398690021117. The reversal of 398690021101 is 101120096893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362342598601 + 36347422500 = 601949^2 + 190650^2 .

It is an emirp because it is prime and its reverse (101120096893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398690021101 - 2³¹ = 396542537453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398690021141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199345010550 + 199345010551.

It is an arithmetic number, because the mean of its divisors is an integer number (199345010551).

Almost surely, 2^398690021101 is an apocalyptic number.

It is an amenable number.

398690021101 is a deficient number, since it is larger than the sum of its proper divisors (1).

398690021101 is an equidigital number, since it uses as much as digits as its factorization.

398690021101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 398690021101 in words is "three hundred ninety-eight billion, six hundred ninety million, twenty-one thousand, one hundred one".