20121121120111 has 6 divisors (see below), whose sum is σ = 22116604206536. Its totient is φ = 18291928290900.

The previous prime is 20121121119997. The next prime is 20121121120147. The reversal of 20121121120111 is 11102112112102.

It is not a de Polignac number, because 20121121120111 - 2¹³ = 20121121111919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121121120171) 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, 83145128475 + ... + 83145128716.

Almost surely, 2^{20121121120111} is an apocalyptic number.

20121121120111 is a deficient number, since it is larger than the sum of its proper divisors (1995483086425).

20121121120111 is a wasteful number, since it uses less digits than its factorization.

20121121120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166290257213 (or 166290257202 counting only the distinct ones).

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

Adding to 20121121120111 its reverse (11102112112102), we get a palindrome (31223233232213).

The spelling of 20121121120111 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, one hundred eleven".