104155021 has 2 divisors, whose sum is σ = 104155022. Its totient is φ = 104155020.

The previous prime is 104155019. The next prime is 104155027. The reversal of 104155021 is 120551401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104142025 + 12996 = 10205^2 + 114^2 .

It is an emirp because it is prime and its reverse (120551401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 104155021 - 2¹ = 104155019 is a prime.

Together with 104155019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 104155021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104155027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52077510 + 52077511.

It is an arithmetic number, because the mean of its divisors is an integer number (52077511).

Almost surely, 2^104155021 is an apocalyptic number.

It is an amenable number.

104155021 is a deficient number, since it is larger than the sum of its proper divisors (1).

104155021 is an equidigital number, since it uses as much as digits as its factorization.

104155021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 104155021 is about 10205.6367268290. The cubic root of 104155021 is about 470.5004794000.

The spelling of 104155021 in words is "one hundred four million, one hundred fifty-five thousand, twenty-one".