21110149 has 2 divisors, whose sum is σ = 21110150. Its totient is φ = 21110148.

The previous prime is 21110129. The next prime is 21110179. The reversal of 21110149 is 94101112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 9345249 = 3430^2 + 3057^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110149 - 2⁹ = 21109637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555074 + 10555075.

It is an arithmetic number, because the mean of its divisors is an integer number (10555075).

Almost surely, 2^21110149 is an apocalyptic number.

It is an amenable number.

21110149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110149 is an equidigital number, since it uses as much as digits as its factorization.

21110149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 21110149 is about 4594.5782178563. The cubic root of 21110149 is about 276.3739461411.

The spelling of 21110149 in words is "twenty-one million, one hundred ten thousand, one hundred forty-nine".