21310244047 has 2 divisors, whose sum is σ = 21310244048. Its totient is φ = 21310244046.

The previous prime is 21310243961. The next prime is 21310244051. The reversal of 21310244047 is 74044201312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21310244047 - 2³¹ = 19162760399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310247047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655122023 + 10655122024.

It is an arithmetic number, because the mean of its divisors is an integer number (10655122024).

Almost surely, 2^21310244047 is an apocalyptic number.

21310244047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310244047 is an equidigital number, since it uses as much as digits as its factorization.

21310244047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

Adding to 21310244047 its reverse (74044201312), we get a palindrome (95354445359).

The spelling of 21310244047 in words is "twenty-one billion, three hundred ten million, two hundred forty-four thousand, forty-seven".