20101211021211 has 8 divisors (see below), whose sum is σ = 26801788912704. Its totient is φ = 13400720238600.

The previous prime is 20101211021167. The next prime is 20101211021267. The reversal of 20101211021211 is 11212011210102.

It is a happy number.

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

It is not a de Polignac number, because 20101211021211 - 2¹⁹ = 20101210496923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20101211021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21236865 + ... + 22163186.

It is an arithmetic number, because the mean of its divisors is an integer number (3350223614088).

Almost surely, 2^{20101211021211} is an apocalyptic number.

20101211021211 is a deficient number, since it is larger than the sum of its proper divisors (6700577891493).

20101211021211 is a wasteful number, since it uses less digits than its factorization.

20101211021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43554441.

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

Adding to 20101211021211 its reverse (11212011210102), we get a palindrome (31313222231313).

The spelling of 20101211021211 in words is "twenty trillion, one hundred one billion, two hundred eleven million, twenty-one thousand, two hundred eleven".