21014471 has 2 divisors, whose sum is σ = 21014472. Its totient is φ = 21014470.

The previous prime is 21014459. The next prime is 21014501. The reversal of 21014471 is 17441012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21014471 - 2⁶ = 21014407 is a prime.

It is a super-3 number, since 3×21014471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21017471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507235 + 10507236.

It is an arithmetic number, because the mean of its divisors is an integer number (10507236).

Almost surely, 2^21014471 is an apocalyptic number.

21014471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014471 is an equidigital number, since it uses as much as digits as its factorization.

21014471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 21014471 is about 4584.1543385885. The cubic root of 21014471 is about 275.9557751376.

Adding to 21014471 its reverse (17441012), we get a palindrome (38455483).

The spelling of 21014471 in words is "twenty-one million, fourteen thousand, four hundred seventy-one".