21210212111227 has 2 divisors, whose sum is σ = 21210212111228. Its totient is φ = 21210212111226.

The previous prime is 21210212111113. The next prime is 21210212111281. The reversal of 21210212111227 is 72211121201212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210212111227 - 2¹⁹ = 21210211586939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210212171227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605106055613 + 10605106055614.

It is an arithmetic number, because the mean of its divisors is an integer number (10605106055614).

Almost surely, 2^{21210212111227} is an apocalyptic number.

21210212111227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210212111227 is an equidigital number, since it uses as much as digits as its factorization.

21210212111227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 21210212111227 its reverse (72211121201212), we get a palindrome (93421333312439).

The spelling of 21210212111227 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-seven".