21512530324331 has 2 divisors, whose sum is σ = 21512530324332. Its totient is φ = 21512530324330.

The previous prime is 21512530324319. The next prime is 21512530324343. The reversal of 21512530324331 is 13342303521512.

It is a balanced prime because it is at equal distance from previous prime (21512530324319) and next prime (21512530324343).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21512530324331 is a prime.

It is a super-2 number, since 2×21512530324331² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21512530324291 and 21512530324300.

It is not a weakly prime, because it can be changed into another prime (21512530323331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10756265162165 + 10756265162166.

It is an arithmetic number, because the mean of its divisors is an integer number (10756265162166).

Almost surely, 2^{21512530324331} is an apocalyptic number.

21512530324331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21512530324331 is an equidigital number, since it uses as much as digits as its factorization.

21512530324331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 21512530324331 its reverse (13342303521512), we get a palindrome (34854833845843).

The spelling of 21512530324331 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty million, three hundred twenty-four thousand, three hundred thirty-one".