21467471 has 2 divisors, whose sum is σ = 21467472. Its totient is φ = 21467470.

The previous prime is 21467461. The next prime is 21467483. The reversal of 21467471 is 17476412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21467471 - 2²² = 17273167 is a prime.

It is a super-3 number, since 3×21467471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21467431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733735 + 10733736.

It is an arithmetic number, because the mean of its divisors is an integer number (10733736).

Almost surely, 2^21467471 is an apocalyptic number.

21467471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21467471 is an equidigital number, since it uses as much as digits as its factorization.

21467471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 21467471 is about 4633.3002276995. The cubic root of 21467471 is about 277.9245823059.

The spelling of 21467471 in words is "twenty-one million, four hundred sixty-seven thousand, four hundred seventy-one".