21034249 has 2 divisors, whose sum is σ = 21034250. Its totient is φ = 21034248.

The previous prime is 21034231. The next prime is 21034261. The reversal of 21034249 is 94243012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 1071225 = 4468^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034249 - 2⁹ = 21033737 is a prime.

It is not a weakly prime, because it can be changed into another prime (21034229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517124 + 10517125.

It is an arithmetic number, because the mean of its divisors is an integer number (10517125).

Almost surely, 2^21034249 is an apocalyptic number.

It is an amenable number.

21034249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034249 is an equidigital number, since it uses as much as digits as its factorization.

21034249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21034249 is about 4586.3110448377. The cubic root of 21034249 is about 276.0423209275.

It can be divided in two parts, 21034 and 249, that multiplied together give a triangular number (5237466 = T₃₂₃₆).

The spelling of 21034249 in words is "twenty-one million, thirty-four thousand, two hundred forty-nine".