21325319 has 2 divisors, whose sum is σ = 21325320. Its totient is φ = 21325318.

The previous prime is 21325313. The next prime is 21325331. The reversal of 21325319 is 91352312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21325319 - 2¹⁶ = 21259783 is a prime.

It is a super-2 number, since 2×21325319² = 909538460903522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21325313) 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, 10662659 + 10662660.

It is an arithmetic number, because the mean of its divisors is an integer number (10662660).

Almost surely, 2^21325319 is an apocalyptic number.

21325319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325319 is an equidigital number, since it uses as much as digits as its factorization.

21325319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 21325319 is about 4617.9344949880. The cubic root of 21325319 is about 277.3097752130.

The spelling of 21325319 in words is "twenty-one million, three hundred twenty-five thousand, three hundred nineteen".