21471067 has 2 divisors, whose sum is σ = 21471068. Its totient is φ = 21471066.

The previous prime is 21471041. The next prime is 21471077. The reversal of 21471067 is 76017412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21471067 is a prime.

It is a super-2 number, since 2×21471067² = 922013436236978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21471077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735533 + 10735534.

It is an arithmetic number, because the mean of its divisors is an integer number (10735534).

Almost surely, 2^21471067 is an apocalyptic number.

21471067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21471067 is an equidigital number, since it uses as much as digits as its factorization.

21471067 is an evil number, because the sum of its binary digits is even.

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

The square root of 21471067 is about 4633.6882717766. The cubic root of 21471067 is about 277.9400997524.

Adding to 21471067 its reverse (76017412), we get a palindrome (97488479).

The spelling of 21471067 in words is "twenty-one million, four hundred seventy-one thousand, sixty-seven".