20121120021111 has 16 divisors (see below), whose sum is σ = 26968973856768. Its totient is φ = 13343674935200.

The previous prime is 20121120021089. The next prime is 20121120021169. The reversal of 20121120021111 is 11112002112102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20121120021111 - 2⁷ = 20121120020983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121120029111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55473001 + ... + 55834541.

It is an arithmetic number, because the mean of its divisors is an integer number (1685560866048).

Almost surely, 2^{20121120021111} is an apocalyptic number.

20121120021111 is a deficient number, since it is larger than the sum of its proper divisors (6847853835657).

20121120021111 is a wasteful number, since it uses less digits than its factorization.

20121120021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458862.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20121120021111 its reverse (11112002112102), we get a palindrome (31233122133213).

The spelling of 20121120021111 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty million, twenty-one thousand, one hundred eleven".