21141361 has 2 divisors, whose sum is σ = 21141362. Its totient is φ = 21141360.

The previous prime is 21141317. The next prime is 21141371. The reversal of 21141361 is 16314112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 3240000 = 4231^2 + 1800^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141361 - 2⁷ = 21141233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21141371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570680 + 10570681.

It is an arithmetic number, because the mean of its divisors is an integer number (10570681).

Almost surely, 2^21141361 is an apocalyptic number.

It is an amenable number.

21141361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141361 is an equidigital number, since it uses as much as digits as its factorization.

21141361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 21141361 is about 4597.9735753917. The cubic root of 21141361 is about 276.5100881730.

Adding to 21141361 its reverse (16314112), we get a palindrome (37455473).

The spelling of 21141361 in words is "twenty-one million, one hundred forty-one thousand, three hundred sixty-one".