20101122211 has 4 divisors (see below), whose sum is σ = 20254566024. Its totient is φ = 19947678400.

The previous prime is 20101122203. The next prime is 20101122229. The reversal of 20101122211 is 11222110102.

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 20101122211 - 2³ = 20101122203 is a prime.

It is a super-2 number, since 2×20101122211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101122191 and 20101122200.

It is not an unprimeable number, because it can be changed into a prime (20101122241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76721710 + ... + 76721971.

It is an arithmetic number, because the mean of its divisors is an integer number (5063641506).

Almost surely, 2^20101122211 is an apocalyptic number.

20101122211 is a deficient number, since it is larger than the sum of its proper divisors (153443813).

20101122211 is a wasteful number, since it uses less digits than its factorization.

20101122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153443812.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20101122211 its reverse (11222110102), we get a palindrome (31323232313).

The spelling of 20101122211 in words is "twenty billion, one hundred one million, one hundred twenty-two thousand, two hundred eleven".