21107369 has 2 divisors, whose sum is σ = 21107370. Its totient is φ = 21107368.

The previous prime is 21107357. The next prime is 21107381. The reversal of 21107369 is 96370112.

It is a balanced prime because it is at equal distance from previous prime (21107357) and next prime (21107381).

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 5583769 = 3940^2 + 2363^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21107369 is a prime.

It is a super-2 number, since 2×21107369² = 891042052204322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21107269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553684 + 10553685.

It is an arithmetic number, because the mean of its divisors is an integer number (10553685).

Almost surely, 2^21107369 is an apocalyptic number.

It is an amenable number.

21107369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21107369 is an equidigital number, since it uses as much as digits as its factorization.

21107369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21107369 is about 4594.2756774055. The cubic root of 21107369 is about 276.3618136940.

The spelling of 21107369 in words is "twenty-one million, one hundred seven thousand, three hundred sixty-nine".