21376193 has 2 divisors, whose sum is σ = 21376194. Its totient is φ = 21376192.

The previous prime is 21376189. The next prime is 21376217. The reversal of 21376193 is 39167312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 9042049 = 3512^2 + 3007^2 .

It is a cyclic number.

It is not a de Polignac number, because 21376193 - 2² = 21376189 is a prime.

It is not a weakly prime, because it can be changed into another prime (21376133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688096 + 10688097.

It is an arithmetic number, because the mean of its divisors is an integer number (10688097).

Almost surely, 2^21376193 is an apocalyptic number.

It is an amenable number.

21376193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21376193 is an equidigital number, since it uses as much as digits as its factorization.

21376193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 21376193 is about 4623.4395205301. The cubic root of 21376193 is about 277.5301182039.

The spelling of 21376193 in words is "twenty-one million, three hundred seventy-six thousand, one hundred ninety-three".