20121031120 has 80 divisors (see below), whose sum is σ = 50390203392. Its totient is φ = 7450122240.

The previous prime is 20121031093. The next prime is 20121031121. The reversal of 20121031120 is 2113012102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 20121031120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121031121) 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, 119337 + ... + 233416.

Almost surely, 2^20121031120 is an apocalyptic number.

20121031120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121031120 is an abundant number, since it is smaller than the sum of its proper divisors (30269172272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121031120 is a wasteful number, since it uses less digits than its factorization.

20121031120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352820 (or 352814 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20121031120 its reverse (2113012102), we get a palindrome (22234043222).

The spelling of 20121031120 in words is "twenty billion, one hundred twenty-one million, thirty-one thousand, one hundred twenty".