20110121211 has 32 divisors (see below), whose sum is σ = 27476547840. Its totient is φ = 13079984000.

The previous prime is 20110121179. The next prime is 20110121233. The reversal of 20110121211 is 11212101102.

It is a cyclic number.

It is not a de Polignac number, because 20110121211 - 2⁵ = 20110121179 is a prime.

It is a super-2 number, since 2×20110121211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20110121281) 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, 12800056 + ... + 12801626.

It is an arithmetic number, because the mean of its divisors is an integer number (858642120).

Almost surely, 2^20110121211 is an apocalyptic number.

20110121211 is a deficient number, since it is larger than the sum of its proper divisors (7366426629).

20110121211 is a wasteful number, since it uses less digits than its factorization.

20110121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267.

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

Adding to 20110121211 its reverse (11212101102), we get a palindrome (31322222313).

The spelling of 20110121211 in words is "twenty billion, one hundred ten million, one hundred twenty-one thousand, two hundred eleven".