20120111101987 has 16 divisors (see below), whose sum is σ = 21708580741120. Its totient is φ = 18537483031200.

The previous prime is 20120111101957. The next prime is 20120111102029. The reversal of 20120111101987 is 78910111102102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20120111101987 - 2¹¹ = 20120111099939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20120111101957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27454714 + ... + 28178032.

It is an arithmetic number, because the mean of its divisors is an integer number (1356786296320).

Almost surely, 2^{20120111101987} is an apocalyptic number.

20120111101987 is a deficient number, since it is larger than the sum of its proper divisors (1588469639133).

20120111101987 is a wasteful number, since it uses less digits than its factorization.

20120111101987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727354.

The product of its (nonzero) digits is 2016, while the sum is 34.

The spelling of 20120111101987 in words is "twenty trillion, one hundred twenty billion, one hundred eleven million, one hundred one thousand, nine hundred eighty-seven".