21030323047 has 2 divisors, whose sum is σ = 21030323048. Its totient is φ = 21030323046.

The previous prime is 21030323023. The next prime is 21030323051. The reversal of 21030323047 is 74032303012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21030323047 - 2¹⁵ = 21030290279 is a prime.

It is a super-2 number, since 2×21030323047² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030323747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515161523 + 10515161524.

It is an arithmetic number, because the mean of its divisors is an integer number (10515161524).

Almost surely, 2^21030323047 is an apocalyptic number.

21030323047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030323047 is an equidigital number, since it uses as much as digits as its factorization.

21030323047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 25.

Adding to 21030323047 its reverse (74032303012), we get a palindrome (95062626059).

The spelling of 21030323047 in words is "twenty-one billion, thirty million, three hundred twenty-three thousand, forty-seven".