21241877 has 2 divisors, whose sum is σ = 21241878. Its totient is φ = 21241876.

The previous prime is 21241873. The next prime is 21241889. The reversal of 21241877 is 77814212.

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., 16048036 + 5193841 = 4006^2 + 2279^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241877 - 2² = 21241873 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21241873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620938 + 10620939.

It is an arithmetic number, because the mean of its divisors is an integer number (10620939).

Almost surely, 2^21241877 is an apocalyptic number.

It is an amenable number.

21241877 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241877 is an equidigital number, since it uses as much as digits as its factorization.

21241877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 32.

The square root of 21241877 is about 4608.8910813774. The cubic root of 21241877 is about 276.9476152856.

The spelling of 21241877 in words is "twenty-one million, two hundred forty-one thousand, eight hundred seventy-seven".