20101121211 has 8 divisors (see below), whose sum is σ = 26921681920. Its totient is φ = 13340653992.

The previous prime is 20101121207. The next prime is 20101121221. The reversal of 20101121211 is 11212110102.

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

It is not a de Polignac number, because 20101121211 - 2² = 20101121207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101121221) 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 7 ways as a sum of consecutive naturals, for example, 15022591 + ... + 15023928.

It is an arithmetic number, because the mean of its divisors is an integer number (3365210240).

Almost surely, 2^20101121211 is an apocalyptic number.

20101121211 is a deficient number, since it is larger than the sum of its proper divisors (6820560709).

20101121211 is a wasteful number, since it uses less digits than its factorization.

20101121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30046745.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20101121211 its reverse (11212110102), we get a palindrome (31313231313).

It can be divided in two parts, 201011 and 21211, that added together give a palindrome (222222).

The spelling of 20101121211 in words is "twenty billion, one hundred one million, one hundred twenty-one thousand, two hundred eleven".