21030677 has 2 divisors, whose sum is σ = 21030678. Its totient is φ = 21030676.

The previous prime is 21030637. The next prime is 21030703. The reversal of 21030677 is 77603012.

It is an a-pointer prime, because the next prime (21030703) can be obtained adding 21030677 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 654481 = 4514^2 + 809^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030677 - 2⁶ = 21030613 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 (21030637) 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, 10515338 + 10515339.

It is an arithmetic number, because the mean of its divisors is an integer number (10515339).

Almost surely, 2^21030677 is an apocalyptic number.

It is an amenable number.

21030677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030677 is an equidigital number, since it uses as much as digits as its factorization.

21030677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 21030677 is about 4585.9216085755. The cubic root of 21030677 is about 276.0266943655.

Adding to 21030677 its reverse (77603012), we get a palindrome (98633689).

The spelling of 21030677 in words is "twenty-one million, thirty thousand, six hundred seventy-seven".