21371027 has 2 divisors, whose sum is σ = 21371028. Its totient is φ = 21371026.

The previous prime is 21371011. The next prime is 21371033. The reversal of 21371027 is 72017312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21371027 - 2⁴ = 21371011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21370993 and 21371011.

It is not a weakly prime, because it can be changed into another prime (21371047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10685513 + 10685514.

It is an arithmetic number, because the mean of its divisors is an integer number (10685514).

Almost surely, 2^21371027 is an apocalyptic number.

21371027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21371027 is an equidigital number, since it uses as much as digits as its factorization.

21371027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21371027 is about 4622.8808117883. The cubic root of 21371027 is about 277.5077594346.

Adding to 21371027 its reverse (72017312), we get a palindrome (93388339).

The spelling of 21371027 in words is "twenty-one million, three hundred seventy-one thousand, twenty-seven".