21234113 has 2 divisors, whose sum is σ = 21234114. Its totient is φ = 21234112.

The previous prime is 21234097. The next prime is 21234127. The reversal of 21234113 is 31143212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19430464 + 1803649 = 4408^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234113 - 2⁴ = 21234097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21234091 and 21234100.

It is not a weakly prime, because it can be changed into another prime (21234013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617056 + 10617057.

It is an arithmetic number, because the mean of its divisors is an integer number (10617057).

Almost surely, 2^21234113 is an apocalyptic number.

It is an amenable number.

21234113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234113 is an equidigital number, since it uses as much as digits as its factorization.

21234113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 21234113 is about 4608.0487193605. The cubic root of 21234113 is about 276.9138693144.

Adding to 21234113 its reverse (31143212), we get a palindrome (52377325).

Subtracting 21234113 from its reverse (31143212), we obtain a palindrome (9909099).

The spelling of 21234113 in words is "twenty-one million, two hundred thirty-four thousand, one hundred thirteen".