21041677 has 2 divisors, whose sum is σ = 21041678. Its totient is φ = 21041676.

The previous prime is 21041659. The next prime is 21041707. The reversal of 21041677 is 77614012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 1425636 = 4429^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 21041677 - 2⁷ = 21041549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21941677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520838 + 10520839.

It is an arithmetic number, because the mean of its divisors is an integer number (10520839).

Almost surely, 2^21041677 is an apocalyptic number.

It is an amenable number.

21041677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041677 is an equidigital number, since it uses as much as digits as its factorization.

21041677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21041677 is about 4587.1207745164. The cubic root of 21041677 is about 276.0748108133.

Adding to 21041677 its reverse (77614012), we get a palindrome (98655689).

The spelling of 21041677 in words is "twenty-one million, forty-one thousand, six hundred seventy-seven".