104021381 has 2 divisors, whose sum is σ = 104021382. Its totient is φ = 104021380.

The previous prime is 104021377. The next prime is 104021383. The reversal of 104021381 is 183120401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72829156 + 31192225 = 8534^2 + 5585^2 .

It is a cyclic number.

It is not a de Polignac number, because 104021381 - 2² = 104021377 is a prime.

It is a super-2 number, since 2×104021381² = 21640895410294322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 104021383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104021383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52010690 + 52010691.

It is an arithmetic number, because the mean of its divisors is an integer number (52010691).

Almost surely, 2^104021381 is an apocalyptic number.

It is an amenable number.

104021381 is a deficient number, since it is larger than the sum of its proper divisors (1).

104021381 is an equidigital number, since it uses as much as digits as its factorization.

104021381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 104021381 is about 10199.0872630839. The cubic root of 104021381 is about 470.2991621865.

Adding to 104021381 its reverse (183120401), we get a palindrome (287141782).

The spelling of 104021381 in words is "one hundred four million, twenty-one thousand, three hundred eighty-one".