21419597 has 2 divisors, whose sum is σ = 21419598. Its totient is φ = 21419596.

The previous prime is 21419591. The next prime is 21419617. The reversal of 21419597 is 79591412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14523721 + 6895876 = 3811^2 + 2626^2 .

It is a cyclic number.

It is not a de Polignac number, because 21419597 - 2⁶ = 21419533 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21419597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21419591) 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, 10709798 + 10709799.

It is an arithmetic number, because the mean of its divisors is an integer number (10709799).

Almost surely, 2^21419597 is an apocalyptic number.

It is an amenable number.

21419597 is a deficient number, since it is larger than the sum of its proper divisors (1).

21419597 is an equidigital number, since it uses as much as digits as its factorization.

21419597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 21419597 is about 4628.1310482742. The cubic root of 21419597 is about 277.7178312892.

The spelling of 21419597 in words is "twenty-one million, four hundred nineteen thousand, five hundred ninety-seven".