20101212121211 has 32 divisors (see below), whose sum is σ = 23328933163200. Its totient is φ = 17181942865920.

The previous prime is 20101212121189. The next prime is 20101212121217. The reversal of 20101212121211 is 11212121210102.

It is a de Polignac number, because none of the positive numbers 2^k-20101212121211 is a prime.

It is a super-2 number, since 2×20101212121211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20101212121211.

It is not an unprimeable number, because it can be changed into a prime (20101212121217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10108886 + ... + 11932811.

It is an arithmetic number, because the mean of its divisors is an integer number (729029161350).

Almost surely, 2^{20101212121211} is an apocalyptic number.

20101212121211 is a deficient number, since it is larger than the sum of its proper divisors (3227721041989).

20101212121211 is a wasteful number, since it uses less digits than its factorization.

20101212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22041839.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20101212121211 its reverse (11212121210102), we get a palindrome (31313333331313).

The spelling of 20101212121211 in words is "twenty trillion, one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".