21035249 has 2 divisors, whose sum is σ = 21035250. Its totient is φ = 21035248.

The previous prime is 21035233. The next prime is 21035269. The reversal of 21035249 is 94253012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11175649 + 9859600 = 3343^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035249 - 2⁴ = 21035233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21035219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517624 + 10517625.

It is an arithmetic number, because the mean of its divisors is an integer number (10517625).

Almost surely, 2^21035249 is an apocalyptic number.

It is an amenable number.

21035249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035249 is an equidigital number, since it uses as much as digits as its factorization.

21035249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21035249 is about 4586.4200636226. The cubic root of 21035249 is about 276.0466953480.

The spelling of 21035249 in words is "twenty-one million, thirty-five thousand, two hundred forty-nine".