20121001201211 has 4 divisors (see below), whose sum is σ = 20241486238512. Its totient is φ = 20000516163912.

The previous prime is 20121001201207. The next prime is 20121001201253. The reversal of 20121001201211 is 11210210012102.

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 20121001201211 - 2² = 20121001201207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121001201261) 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, 60242518400 + ... + 60242518733.

It is an arithmetic number, because the mean of its divisors is an integer number (5060371559628).

Almost surely, 2^{20121001201211} is an apocalyptic number.

20121001201211 is a deficient number, since it is larger than the sum of its proper divisors (120485037301).

20121001201211 is a wasteful number, since it uses less digits than its factorization.

20121001201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120485037300.

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

Adding to 20121001201211 its reverse (11210210012102), we get a palindrome (31331211213313).

The spelling of 20121001201211 in words is "twenty trillion, one hundred twenty-one billion, one million, two hundred one thousand, two hundred eleven".