20121021111211 has 8 divisors (see below), whose sum is σ = 20311048779840. Its totient is φ = 19931030123208.

The previous prime is 20121021111187. The next prime is 20121021111239. The reversal of 20121021111211 is 11211112012102.

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 20121021111211 - 2²⁵ = 20120987556779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121021111271) 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, 8067261 + ... + 10262686.

It is an arithmetic number, because the mean of its divisors is an integer number (2538881097480).

Almost surely, 2^{20121021111211} is an apocalyptic number.

20121021111211 is a deficient number, since it is larger than the sum of its proper divisors (190027668629).

20121021111211 is a wasteful number, since it uses less digits than its factorization.

20121021111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18340313.

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

Adding to 20121021111211 its reverse (11211112012102), we get a palindrome (31332133123313).

The spelling of 20121021111211 in words is "twenty trillion, one hundred twenty-one billion, twenty-one million, one hundred eleven thousand, two hundred eleven".