21343249 has 2 divisors, whose sum is σ = 21343250. Its totient is φ = 21343248.

The previous prime is 21343243. The next prime is 21343261. The reversal of 21343249 is 94234312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 7800849 = 3680^2 + 2793^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343249 - 2¹³ = 21335057 is a prime.

It is equal to p_1350298 and since 21343249 and 1350298 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21343243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671624 + 10671625.

It is an arithmetic number, because the mean of its divisors is an integer number (10671625).

Almost surely, 2^21343249 is an apocalyptic number.

It is an amenable number.

21343249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343249 is an equidigital number, since it uses as much as digits as its factorization.

21343249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 21343249 is about 4619.8754312211. The cubic root of 21343249 is about 277.3874727051.

The spelling of 21343249 in words is "twenty-one million, three hundred forty-three thousand, two hundred forty-nine".