21000212027 has 2 divisors, whose sum is σ = 21000212028. Its totient is φ = 21000212026.

The previous prime is 21000211993. The next prime is 21000212033. The reversal of 21000212027 is 72021200012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000212027 - 2¹² = 21000207931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000211996 and 21000212014.

It is not a weakly prime, because it can be changed into another prime (21000212087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500106013 + 10500106014.

It is an arithmetic number, because the mean of its divisors is an integer number (10500106014).

Almost surely, 2^21000212027 is an apocalyptic number.

21000212027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000212027 is an equidigital number, since it uses as much as digits as its factorization.

21000212027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

Adding to 21000212027 its reverse (72021200012), we get a palindrome (93021412039).

The spelling of 21000212027 in words is "twenty-one billion, two hundred twelve thousand, twenty-seven".