21071467 has 2 divisors, whose sum is σ = 21071468. Its totient is φ = 21071466.

The previous prime is 21071461. The next prime is 21071489. The reversal of 21071467 is 76417012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21071467 - 2⁷ = 21071339 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21071461) 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, 10535733 + 10535734.

It is an arithmetic number, because the mean of its divisors is an integer number (10535734).

Almost surely, 2^21071467 is an apocalyptic number.

21071467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21071467 is an equidigital number, since it uses as much as digits as its factorization.

21071467 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21071467 is about 4590.3667609462. The cubic root of 21071467 is about 276.2050347567.

Adding to 21071467 its reverse (76417012), we get a palindrome (97488479).

The spelling of 21071467 in words is "twenty-one million, seventy-one thousand, four hundred sixty-seven".