20121121100211 has 4 divisors (see below), whose sum is σ = 26828161466952. Its totient is φ = 13414080733472.

The previous prime is 20121121100207. The next prime is 20121121100221. The reversal of 20121121100211 is 11200112112102.

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 20121121100211 - 2² = 20121121100207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121121100221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353520183366 + ... + 3353520183371.

It is an arithmetic number, because the mean of its divisors is an integer number (6707040366738).

Almost surely, 2^{20121121100211} is an apocalyptic number.

20121121100211 is a deficient number, since it is larger than the sum of its proper divisors (6707040366741).

20121121100211 is an equidigital number, since it uses as much as digits as its factorization.

20121121100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707040366740.

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

Adding to 20121121100211 its reverse (11200112112102), we get a palindrome (31321233212313).

The spelling of 20121121100211 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred eleven".