21130027 has 2 divisors, whose sum is σ = 21130028. Its totient is φ = 21130026.

The previous prime is 21130001. The next prime is 21130037. The reversal of 21130027 is 72003112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130027 is a prime.

It is a super-3 number, since 3×21130027³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21130037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565013 + 10565014.

It is an arithmetic number, because the mean of its divisors is an integer number (10565014).

Almost surely, 2^21130027 is an apocalyptic number.

21130027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130027 is an equidigital number, since it uses as much as digits as its factorization.

21130027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21130027 is about 4596.7409106888. The cubic root of 21130027 is about 276.4606664801.

Adding to 21130027 its reverse (72003112), we get a palindrome (93133139).

The spelling of 21130027 in words is "twenty-one million, one hundred thirty thousand, twenty-seven".