21141877 has 2 divisors, whose sum is σ = 21141878. Its totient is φ = 21141876.

The previous prime is 21141871. The next prime is 21141893. The reversal of 21141877 is 77814112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 2531281 = 4314^2 + 1591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21141877 is a prime.

It is equal to p_1338376 and since 21141877 and 1338376 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570938 + 10570939.

It is an arithmetic number, because the mean of its divisors is an integer number (10570939).

Almost surely, 2^21141877 is an apocalyptic number.

It is an amenable number.

21141877 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141877 is an equidigital number, since it uses as much as digits as its factorization.

21141877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 31.

The square root of 21141877 is about 4598.0296867245. The cubic root of 21141877 is about 276.5123377609.

Adding to 21141877 its reverse (77814112), we get a palindrome (98955989).

The spelling of 21141877 in words is "twenty-one million, one hundred forty-one thousand, eight hundred seventy-seven".