20121121211211 has 12 divisors (see below), whose sum is σ = 29147119237600. Its totient is φ = 13375645043760.

The previous prime is 20121121211131. The next prime is 20121121211291. The reversal of 20121121211211 is 11211212112102.

It is a happy number.

20121121211211 is a `hidden beast` number, since 2 + 0 + 121 + 121 + 211 + 211 = 666.

It is an interprime number because it is at equal distance from previous prime (20121121211131) and next prime (20121121211291).

It is not a de Polignac number, because 20121121211211 - 2²² = 20121117016907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121121211291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3202976995 + ... + 3202983276.

Almost surely, 2^{20121121211211} is an apocalyptic number.

20121121211211 is a deficient number, since it is larger than the sum of its proper divisors (9025998026389).

20121121211211 is a wasteful number, since it uses less digits than its factorization.

20121121211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6405960626 (or 6405960623 counting only the distinct ones).

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

Adding to 20121121211211 its reverse (11211212112102), we get a palindrome (31332333323313).

The spelling of 20121121211211 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred eleven".