21536113 has 2 divisors, whose sum is σ = 21536114. Its totient is φ = 21536112.

The previous prime is 21536107. The next prime is 21536117. The reversal of 21536113 is 31163512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 815409 = 4552^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 21536113 - 2⁹ = 21535601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21536117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768056 + 10768057.

It is an arithmetic number, because the mean of its divisors is an integer number (10768057).

Almost surely, 2^21536113 is an apocalyptic number.

It is an amenable number.

21536113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21536113 is an equidigital number, since it uses as much as digits as its factorization.

21536113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 22.

The square root of 21536113 is about 4640.7017788261. The cubic root of 21536113 is about 278.2204873998.

Adding to 21536113 its reverse (31163512), we get a palindrome (52699625).

The spelling of 21536113 in words is "twenty-one million, five hundred thirty-six thousand, one hundred thirteen".