21471713 has 2 divisors, whose sum is σ = 21471714. Its totient is φ = 21471712.

The previous prime is 21471707. The next prime is 21471733. The reversal of 21471713 is 31717412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15864289 + 5607424 = 3983^2 + 2368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21471713 is a prime.

It is a super-2 number, since 2×21471713² = 922068918308738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21471733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735856 + 10735857.

It is an arithmetic number, because the mean of its divisors is an integer number (10735857).

Almost surely, 2^21471713 is an apocalyptic number.

It is an amenable number.

21471713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21471713 is an equidigital number, since it uses as much as digits as its factorization.

21471713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 21471713 is about 4633.7579781426. The cubic root of 21471713 is about 277.9428871857.

The spelling of 21471713 in words is "twenty-one million, four hundred seventy-one thousand, seven hundred thirteen".