20121233211 has 6 divisors (see below), whose sum is σ = 29064003540. Its totient is φ = 13414155468.

The previous prime is 20121233191. The next prime is 20121233233. The reversal of 20121233211 is 11233212102.

20121233211 is a `hidden beast` number, since 201 + 21 + 233 + 211 = 666.

It is not a de Polignac number, because 20121233211 - 2³⁰ = 19047491387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121238211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117846281 + ... + 1117846298.

It is an arithmetic number, because the mean of its divisors is an integer number (4844000590).

Almost surely, 2^20121233211 is an apocalyptic number.

20121233211 is a deficient number, since it is larger than the sum of its proper divisors (8942770329).

20121233211 is a wasteful number, since it uses less digits than its factorization.

20121233211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235692585 (or 2235692582 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20121233211 its reverse (11233212102), we get a palindrome (31354445313).

The spelling of 20121233211 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-three thousand, two hundred eleven".