21150736247 has 2 divisors, whose sum is σ = 21150736248. Its totient is φ = 21150736246.

The previous prime is 21150736237. The next prime is 21150736253. The reversal of 21150736247 is 74263705112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21150736247 - 2⁶ = 21150736183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21150736247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150736207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575368123 + 10575368124.

It is an arithmetic number, because the mean of its divisors is an integer number (10575368124).

Almost surely, 2^21150736247 is an apocalyptic number.

21150736247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150736247 is an equidigital number, since it uses as much as digits as its factorization.

21150736247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 21150736247 in words is "twenty-one billion, one hundred fifty million, seven hundred thirty-six thousand, two hundred forty-seven".