21714401 has 2 divisors, whose sum is σ = 21714402. Its totient is φ = 21714400.

The previous prime is 21714391. The next prime is 21714403. The reversal of 21714401 is 10441712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12952801 + 8761600 = 3599^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 21714401 - 2⁶ = 21714337 is a prime.

Together with 21714403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21714403) 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, 10857200 + 10857201.

It is an arithmetic number, because the mean of its divisors is an integer number (10857201).

Almost surely, 2^21714401 is an apocalyptic number.

It is an amenable number.

21714401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21714401 is an equidigital number, since it uses as much as digits as its factorization.

21714401 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21714401 is about 4659.8713501555. The cubic root of 21714401 is about 278.9861334389.

The spelling of 21714401 in words is "twenty-one million, seven hundred fourteen thousand, four hundred one".