21341249 has 2 divisors, whose sum is σ = 21341250. Its totient is φ = 21341248.

The previous prime is 21341191. The next prime is 21341317. The reversal of 21341249 is 94214312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15460624 + 5880625 = 3932^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 21341249 - 2¹² = 21337153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21341549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670624 + 10670625.

It is an arithmetic number, because the mean of its divisors is an integer number (10670625).

Almost surely, 2^21341249 is an apocalyptic number.

It is an amenable number.

21341249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341249 is an equidigital number, since it uses as much as digits as its factorization.

21341249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 21341249 is about 4619.6589700973. The cubic root of 21341249 is about 277.3788081030.

The spelling of 21341249 in words is "twenty-one million, three hundred forty-one thousand, two hundred forty-nine".