21468677 has 2 divisors, whose sum is σ = 21468678. Its totient is φ = 21468676.

The previous prime is 21468659. The next prime is 21468691. The reversal of 21468677 is 77686412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 1985281 = 4414^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 21468677 - 2¹⁰ = 21467653 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 (21468607) 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, 10734338 + 10734339.

It is an arithmetic number, because the mean of its divisors is an integer number (10734339).

Almost surely, 2^21468677 is an apocalyptic number.

It is an amenable number.

21468677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21468677 is an equidigital number, since it uses as much as digits as its factorization.

21468677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 41.

The square root of 21468677 is about 4633.4303706865. The cubic root of 21468677 is about 277.9297866259.

The spelling of 21468677 in words is "twenty-one million, four hundred sixty-eight thousand, six hundred seventy-seven".