21467317 has 2 divisors, whose sum is σ = 21467318. Its totient is φ = 21467316.

The previous prime is 21467309. The next prime is 21467323. The reversal of 21467317 is 71376412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21169201 + 298116 = 4601^2 + 546^2 .

It is a cyclic number.

It is not a de Polignac number, because 21467317 - 2³ = 21467309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21467357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733658 + 10733659.

It is an arithmetic number, because the mean of its divisors is an integer number (10733659).

Almost surely, 2^21467317 is an apocalyptic number.

It is an amenable number.

21467317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21467317 is an equidigital number, since it uses as much as digits as its factorization.

21467317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

The square root of 21467317 is about 4633.2836088459. The cubic root of 21467317 is about 277.9239177269.

The spelling of 21467317 in words is "twenty-one million, four hundred sixty-seven thousand, three hundred seventeen".