20121112121211 has 12 divisors (see below), whose sum is σ = 29087710170792. Its totient is φ = 13403052493056.

The previous prime is 20121112121183. The next prime is 20121112121249. The reversal of 20121112121211 is 11212121112102.

It is a happy number.

20121112121211 is a `hidden beast` number, since 201 + 21 + 112 + 121 + 211 = 666.

It is not a de Polignac number, because 20121112121211 - 2²⁶ = 20121045012347 is a prime.

It is a super-2 number, since 2×20121112121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20121112021211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 918509641 + ... + 918531546.

It is an arithmetic number, because the mean of its divisors is an integer number (2423975847566).

Almost surely, 2^{20121112121211} is an apocalyptic number.

20121112121211 is a deficient number, since it is larger than the sum of its proper divisors (8966598049581).

20121112121211 is a wasteful number, since it uses less digits than its factorization.

20121112121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837042410 (or 1837042407 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 20121112121211 its reverse (11212121112102), we get a palindrome (31333233233313).

The spelling of 20121112121211 in words is "twenty trillion, one hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, two hundred eleven".