21208271027 has 2 divisors, whose sum is σ = 21208271028. Its totient is φ = 21208271026.

The previous prime is 21208271011. The next prime is 21208271057. The reversal of 21208271027 is 72017280212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21208271027 - 2⁴ = 21208271011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21208270984 and 21208271002.

It is not a weakly prime, because it can be changed into another prime (21208271057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10604135513 + 10604135514.

It is an arithmetic number, because the mean of its divisors is an integer number (10604135514).

Almost surely, 2^21208271027 is an apocalyptic number.

21208271027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21208271027 is an equidigital number, since it uses as much as digits as its factorization.

21208271027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 32.

The spelling of 21208271027 in words is "twenty-one billion, two hundred eight million, two hundred seventy-one thousand, twenty-seven".