21303001249 has 2 divisors, whose sum is σ = 21303001250. Its totient is φ = 21303001248.

The previous prime is 21303001211. The next prime is 21303001253. The reversal of 21303001249 is 94210030312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13737480849 + 7565520400 = 117207^2 + 86980^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303001249 - 2¹³ = 21302993057 is a prime.

It is not a weakly prime, because it can be changed into another prime (21303001289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651500624 + 10651500625.

It is an arithmetic number, because the mean of its divisors is an integer number (10651500625).

Almost surely, 2^21303001249 is an apocalyptic number.

It is an amenable number.

21303001249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303001249 is an equidigital number, since it uses as much as digits as its factorization.

21303001249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21303001249 in words is "twenty-one billion, three hundred three million, one thousand, two hundred forty-nine".