21211210212211 has 2 divisors, whose sum is σ = 21211210212212. Its totient is φ = 21211210212210.

The previous prime is 21211210212191. The next prime is 21211210212233. The reversal of 21211210212211 is 11221201211212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211210212211 - 2³¹ = 21209062728563 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211210212611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605605106105 + 10605605106106.

It is an arithmetic number, because the mean of its divisors is an integer number (10605605106106).

Almost surely, 2^{21211210212211} is an apocalyptic number.

21211210212211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211210212211 is an equidigital number, since it uses as much as digits as its factorization.

21211210212211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211210212211 its reverse (11221201211212), we get a palindrome (32432411423423).

Subtracting from 21211210212211 its reverse (11221201211212), we obtain a palindrome (9990009000999).

The spelling of 21211210212211 in words is "twenty-one trillion, two hundred eleven billion, two hundred ten million, two hundred twelve thousand, two hundred eleven".