21863141 has 2 divisors, whose sum is σ = 21863142. Its totient is φ = 21863140.

The previous prime is 21863119. The next prime is 21863159. The reversal of 21863141 is 14136812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 5982916 = 3985^2 + 2446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21863141 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21863141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21863161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10931570 + 10931571.

It is an arithmetic number, because the mean of its divisors is an integer number (10931571).

Almost surely, 2^21863141 is an apocalyptic number.

It is an amenable number.

21863141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21863141 is an equidigital number, since it uses as much as digits as its factorization.

21863141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 21863141 is about 4675.8037811696. The cubic root of 21863141 is about 279.6216872146.

Adding to 21863141 its reverse (14136812), we get a palindrome (35999953).

The spelling of 21863141 in words is "twenty-one million, eight hundred sixty-three thousand, one hundred forty-one".