21414571 has 2 divisors, whose sum is σ = 21414572. Its totient is φ = 21414570.

The previous prime is 21414551. The next prime is 21414619. The reversal of 21414571 is 17541412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21414571 - 2¹⁹ = 20890283 is a prime.

It is a super-2 number, since 2×21414571² = 917167702228082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21414551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707285 + 10707286.

It is an arithmetic number, because the mean of its divisors is an integer number (10707286).

Almost surely, 2^21414571 is an apocalyptic number.

21414571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414571 is an equidigital number, since it uses as much as digits as its factorization.

21414571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 25.

The square root of 21414571 is about 4627.5880326580. The cubic root of 21414571 is about 277.6961078956.

Adding to 21414571 its reverse (17541412), we get a palindrome (38955983).

The spelling of 21414571 in words is "twenty-one million, four hundred fourteen thousand, five hundred seventy-one".