21530303027 has 2 divisors, whose sum is σ = 21530303028. Its totient is φ = 21530303026.

The previous prime is 21530303023. The next prime is 21530303077. The reversal of 21530303027 is 72030303512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21530303027 - 2² = 21530303023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21530302987 and 21530303005.

It is not a weakly prime, because it can be changed into another prime (21530303023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10765151513 + 10765151514.

It is an arithmetic number, because the mean of its divisors is an integer number (10765151514).

Almost surely, 2^21530303027 is an apocalyptic number.

21530303027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21530303027 is an equidigital number, since it uses as much as digits as its factorization.

21530303027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 26.

Adding to 21530303027 its reverse (72030303512), we get a palindrome (93560606539).

The spelling of 21530303027 in words is "twenty-one billion, five hundred thirty million, three hundred three thousand, twenty-seven".