20121211221011 has 8 divisors (see below), whose sum is σ = 20406566214144. Its totient is φ = 19835910607240.

The previous prime is 20121211220993. The next prime is 20121211221049. The reversal of 20121211221011 is 11012211212102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121211221011 - 2⁶ = 20121211220947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121211221091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12849275 + ... + 14329908.

It is an arithmetic number, because the mean of its divisors is an integer number (2550820776768).

Almost surely, 2^{20121211221011} is an apocalyptic number.

20121211221011 is a deficient number, since it is larger than the sum of its proper divisors (285354993133).

20121211221011 is a wasteful number, since it uses less digits than its factorization.

20121211221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27189681.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20121211221011 its reverse (11012211212102), we get a palindrome (31133422433113).

The spelling of 20121211221011 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, eleven".