21514369 has 2 divisors, whose sum is σ = 21514370. Its totient is φ = 21514368.

The previous prime is 21514301. The next prime is 21514387. The reversal of 21514369 is 96341512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 2286144 = 4385^2 + 1512^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514369 - 2²¹ = 19417217 is a prime.

It is a super-2 number, since 2×21514369² = 925736146936322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21514369.

It is not a weakly prime, because it can be changed into another prime (21514399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757184 + 10757185.

It is an arithmetic number, because the mean of its divisors is an integer number (10757185).

Almost surely, 2^21514369 is an apocalyptic number.

It is an amenable number.

21514369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514369 is an equidigital number, since it uses as much as digits as its factorization.

21514369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 21514369 is about 4638.3584380684. The cubic root of 21514369 is about 278.1268204905.

The spelling of 21514369 in words is "twenty-one million, five hundred fourteen thousand, three hundred sixty-nine".