12121201211211 has 32 divisors (see below), whose sum is σ = 18589554984000. Its totient is φ = 7796691915264.

The previous prime is 12121201211209. The next prime is 12121201211243. The reversal of 12121201211211 is 11211210212121.

It is a happy number.

12121201211211 is a `hidden beast` number, since 1 + 21 + 21 + 201 + 211 + 211 = 666.

It is not a de Polignac number, because 12121201211211 - 2¹ = 12121201211209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121201211011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4297630 + ... + 6535443.

It is an arithmetic number, because the mean of its divisors is an integer number (580923593250).

Almost surely, 2^{12121201211211} is an apocalyptic number.

12121201211211 is a deficient number, since it is larger than the sum of its proper divisors (6468353772789).

12121201211211 is a wasteful number, since it uses less digits than its factorization.

12121201211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10834540 (or 10834534 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121201211211 its reverse (11211210212121), we get a palindrome (23332411423332).

The spelling of 12121201211211 in words is "twelve trillion, one hundred twenty-one billion, two hundred one million, two hundred eleven thousand, two hundred eleven".