21436319 has 2 divisors, whose sum is σ = 21436320. Its totient is φ = 21436318.

The previous prime is 21436301. The next prime is 21436333. The reversal of 21436319 is 91363412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21436319 is a prime.

It is a super-2 number, since 2×21436319² = 919031544539522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21436291 and 21436300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21436339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10718159 + 10718160.

It is an arithmetic number, because the mean of its divisors is an integer number (10718160).

Almost surely, 2^21436319 is an apocalyptic number.

21436319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21436319 is an equidigital number, since it uses as much as digits as its factorization.

21436319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 21436319 is about 4629.9372565943. The cubic root of 21436319 is about 277.7900827201.

The spelling of 21436319 in words is "twenty-one million, four hundred thirty-six thousand, three hundred nineteen".