21301219 has 2 divisors, whose sum is σ = 21301220. Its totient is φ = 21301218.

The previous prime is 21301201. The next prime is 21301229. The reversal of 21301219 is 91210312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301219 is a prime.

It is a super-2 number, since 2×21301219² = 907483861771922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21301196 and 21301205.

It is not a weakly prime, because it can be changed into another prime (21301229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650609 + 10650610.

It is an arithmetic number, because the mean of its divisors is an integer number (10650610).

Almost surely, 2^21301219 is an apocalyptic number.

21301219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301219 is an equidigital number, since it uses as much as digits as its factorization.

21301219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21301219 is about 4615.3243656324. The cubic root of 21301219 is about 277.2052721300.

The spelling of 21301219 in words is "twenty-one million, three hundred one thousand, two hundred nineteen".