21471367 has 2 divisors, whose sum is σ = 21471368. Its totient is φ = 21471366.

The previous prime is 21471341. The next prime is 21471371. The reversal of 21471367 is 76317412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21471367 - 2⁷ = 21471239 is a prime.

It is a super-2 number, since 2×21471367² = 922039201697378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21471337) 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, 10735683 + 10735684.

It is an arithmetic number, because the mean of its divisors is an integer number (10735684).

Almost surely, 2^21471367 is an apocalyptic number.

21471367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21471367 is an equidigital number, since it uses as much as digits as its factorization.

21471367 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21471367 is about 4633.7206432844. The cubic root of 21471367 is about 277.9413942330.

Adding to 21471367 its reverse (76317412), we get a palindrome (97788779).

It can be divided in two parts, 2 and 1471367, that added together give a square (1471369 = 1213²).

The spelling of 21471367 in words is "twenty-one million, four hundred seventy-one thousand, three hundred sixty-seven".