21302434249 has 2 divisors, whose sum is σ = 21302434250. Its totient is φ = 21302434248.

The previous prime is 21302434229. The next prime is 21302434333. The reversal of 21302434249 is 94243420312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21266972224 + 35462025 = 145832^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302434249 - 2⁵ = 21302434217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21302434229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651217124 + 10651217125.

It is an arithmetic number, because the mean of its divisors is an integer number (10651217125).

Almost surely, 2^21302434249 is an apocalyptic number.

It is an amenable number.

21302434249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302434249 is an equidigital number, since it uses as much as digits as its factorization.

21302434249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 21302434249 in words is "twenty-one billion, three hundred two million, four hundred thirty-four thousand, two hundred forty-nine".