21211001027 has 2 divisors, whose sum is σ = 21211001028. Its totient is φ = 21211001026.

The previous prime is 21211000973. The next prime is 21211001039. The reversal of 21211001027 is 72010011212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211001027 - 2¹² = 21210996931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211000996 and 21211001014.

It is not a weakly prime, because it can be changed into another prime (21211001527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605500513 + 10605500514.

It is an arithmetic number, because the mean of its divisors is an integer number (10605500514).

Almost surely, 2^21211001027 is an apocalyptic number.

21211001027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211001027 is an equidigital number, since it uses as much as digits as its factorization.

21211001027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 21211001027 its reverse (72010011212), we get a palindrome (93221012239).

The spelling of 21211001027 in words is "twenty-one billion, two hundred eleven million, one thousand, twenty-seven".