20121211210011 has 4 divisors (see below), whose sum is σ = 26828281613352. Its totient is φ = 13414140806672.

The previous prime is 20121211210007. The next prime is 20121211210013. The reversal of 20121211210011 is 11001211212102.

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 20121211210011 - 2² = 20121211210007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121211210013) 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, 3353535201666 + ... + 3353535201671.

It is an arithmetic number, because the mean of its divisors is an integer number (6707070403338).

Almost surely, 2^{20121211210011} is an apocalyptic number.

20121211210011 is a deficient number, since it is larger than the sum of its proper divisors (6707070403341).

20121211210011 is an equidigital number, since it uses as much as digits as its factorization.

20121211210011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707070403340.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20121211210011 its reverse (11001211212102), we get a palindrome (31122422422113).

The spelling of 20121211210011 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, eleven".