20120212112111 has 16 divisors (see below), whose sum is σ = 20852826951840. Its totient is φ = 19390193786880.

The previous prime is 20120212112087. The next prime is 20120212112153. The reversal of 20120212112111 is 11121121202102.

It is a cyclic number.

It is not a de Polignac number, because 20120212112111 - 2³⁸ = 19845334205167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20120212112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120212112911) 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, 133973015 + ... + 134123111.

It is an arithmetic number, because the mean of its divisors is an integer number (1303301684490).

Almost surely, 2^{20120212112111} is an apocalyptic number.

20120212112111 is a deficient number, since it is larger than the sum of its proper divisors (732614839729).

20120212112111 is a wasteful number, since it uses less digits than its factorization.

20120212112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158714.

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

Adding to 20120212112111 its reverse (11121121202102), we get a palindrome (31241333314213).

The spelling of 20120212112111 in words is "twenty trillion, one hundred twenty billion, two hundred twelve million, one hundred twelve thousand, one hundred eleven".