21107101 has 2 divisors, whose sum is σ = 21107102. Its totient is φ = 21107100.

The previous prime is 21107083. The next prime is 21107117. The reversal of 21107101 is 10170112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15202201 + 5904900 = 3899^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 21107101 - 2²³ = 12718493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21107701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553550 + 10553551.

It is an arithmetic number, because the mean of its divisors is an integer number (10553551).

Almost surely, 2^21107101 is an apocalyptic number.

It is an amenable number.

21107101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21107101 is an equidigital number, since it uses as much as digits as its factorization.

21107101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 21107101 is about 4594.2465105826. The cubic root of 21107101 is about 276.3606440349.

Adding to 21107101 its reverse (10170112), we get a palindrome (31277213).

The spelling of 21107101 in words is "twenty-one million, one hundred seven thousand, one hundred one".