21141161 has 2 divisors, whose sum is σ = 21141162. Its totient is φ = 21141160.

The previous prime is 21141143. The next prime is 21141227. The reversal of 21141161 is 16114112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 10118761 = 3320^2 + 3181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21141161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21141061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570580 + 10570581.

It is an arithmetic number, because the mean of its divisors is an integer number (10570581).

Almost surely, 2^21141161 is an apocalyptic number.

It is an amenable number.

21141161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141161 is an equidigital number, since it uses as much as digits as its factorization.

21141161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

The square root of 21141161 is about 4597.9518266289. The cubic root of 21141161 is about 276.5092162299.

Adding to 21141161 its reverse (16114112), we get a palindrome (37255273).

The spelling of 21141161 in words is "twenty-one million, one hundred forty-one thousand, one hundred sixty-one".