1212211212211 has 4 divisors (see below), whose sum is σ = 1225831563000. Its totient is φ = 1198590861424.

The previous prime is 1212211212197. The next prime is 1212211212227. The reversal of 1212211212211 is 1122121122121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212211212211 - 2⁹ = 1212211211699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212211242211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6810175261 + ... + 6810175438.

It is an arithmetic number, because the mean of its divisors is an integer number (306457890750).

Almost surely, 2^{1212211212211} is an apocalyptic number.

1212211212211 is a deficient number, since it is larger than the sum of its proper divisors (13620350789).

1212211212211 is an equidigital number, since it uses as much as digits as its factorization.

1212211212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13620350788.

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

Adding to 1212211212211 its reverse (1122121122121), we get a palindrome (2334332334332).

The spelling of 1212211212211 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred eleven".