21914017 has 2 divisors, whose sum is σ = 21914018. Its totient is φ = 21914016.

The previous prime is 21913979. The next prime is 21914023. The reversal of 21914017 is 71041912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21446161 + 467856 = 4631^2 + 684^2 .

It is a cyclic number.

It is not a de Polignac number, because 21914017 - 2¹¹ = 21911969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21913982 and 21914000.

It is not a weakly prime, because it can be changed into another prime (21914077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10957008 + 10957009.

It is an arithmetic number, because the mean of its divisors is an integer number (10957009).

Almost surely, 2^21914017 is an apocalyptic number.

It is an amenable number.

21914017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21914017 is an equidigital number, since it uses as much as digits as its factorization.

21914017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21914017 is about 4681.2409679486. The cubic root of 21914017 is about 279.8384144214.

Adding to 21914017 its reverse (71041912), we get a palindrome (92955929).

The spelling of 21914017 in words is "twenty-one million, nine hundred fourteen thousand, seventeen".