104215021 has 2 divisors, whose sum is σ = 104215022. Its totient is φ = 104215020.

The previous prime is 104214997. The next prime is 104215031. The reversal of 104215021 is 120512401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65836996 + 38378025 = 8114^2 + 6195^2 .

It is an emirp because it is prime and its reverse (120512401) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-104215021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 104214986 and 104215004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104215031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52107510 + 52107511.

It is an arithmetic number, because the mean of its divisors is an integer number (52107511).

Almost surely, 2^104215021 is an apocalyptic number.

It is an amenable number.

104215021 is a deficient number, since it is larger than the sum of its proper divisors (1).

104215021 is an equidigital number, since it uses as much as digits as its factorization.

104215021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 104215021 is about 10208.5758556226. The cubic root of 104215021 is about 470.5908082497.

Adding to 104215021 its reverse (120512401), we get a palindrome (224727422).

The spelling of 104215021 in words is "one hundred four million, two hundred fifteen thousand, twenty-one".