21436117 has 2 divisors, whose sum is σ = 21436118. Its totient is φ = 21436116.

The previous prime is 21436091. The next prime is 21436147. The reversal of 21436117 is 71163412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11029041 + 10407076 = 3321^2 + 3226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21436117 is a prime.

It is a super-2 number, since 2×21436117² = 919014224075378, which contains 22 as substring.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21436091 and 21436100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21436147) 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, 10718058 + 10718059.

It is an arithmetic number, because the mean of its divisors is an integer number (10718059).

Almost surely, 2^21436117 is an apocalyptic number.

It is an amenable number.

21436117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21436117 is an equidigital number, since it uses as much as digits as its factorization.

21436117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 21436117 is about 4629.9154419924. The cubic root of 21436117 is about 277.7892101547.

Adding to 21436117 its reverse (71163412), we get a palindrome (92599529).

The spelling of 21436117 in words is "twenty-one million, four hundred thirty-six thousand, one hundred seventeen".