20121211211 has 8 divisors (see below), whose sum is σ = 20417644800. Its totient is φ = 19825139880.

The previous prime is 20121211171. The next prime is 20121211267. The reversal of 20121211211 is 11211212102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121211211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121211711) 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 7 ways as a sum of consecutive naturals, for example, 22370 + ... + 201848.

It is an arithmetic number, because the mean of its divisors is an integer number (2552205600).

Almost surely, 2^20121211211 is an apocalyptic number.

20121211211 is a deficient number, since it is larger than the sum of its proper divisors (296433589).

20121211211 is a wasteful number, since it uses less digits than its factorization.

20121211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181129.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20121211211 its reverse (11211212102), we get a palindrome (31332423313).

The spelling of 20121211211 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, two hundred eleven".