21113101 has 2 divisors, whose sum is σ = 21113102. Its totient is φ = 21113100.

The previous prime is 21113089. The next prime is 21113111. The reversal of 21113101 is 10131112.

It is an a-pointer prime, because the next prime (21113111) can be obtained adding 21113101 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16597476 + 4515625 = 4074^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113101 - 2⁵ = 21113069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556550 + 10556551.

It is an arithmetic number, because the mean of its divisors is an integer number (10556551).

Almost surely, 2^21113101 is an apocalyptic number.

It is an amenable number.

21113101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113101 is an equidigital number, since it uses as much as digits as its factorization.

21113101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 21113101 is about 4594.8994548303. The cubic root of 21113101 is about 276.3868280629.

Adding to 21113101 its reverse (10131112), we get a palindrome (31244213).

The spelling of 21113101 in words is "twenty-one million, one hundred thirteen thousand, one hundred one".