20121133120 has 56 divisors (see below), whose sum is σ = 52269225408. Its totient is φ = 7316774400.

The previous prime is 20121133103. The next prime is 20121133157. The reversal of 20121133120 is 2133112102.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20121133094 and 20121133103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2854596 + ... + 2861635.

Almost surely, 2^20121133120 is an apocalyptic number.

20121133120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121133120 is an abundant number, since it is smaller than the sum of its proper divisors (32148092288).

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

20121133120 is a wasteful number, since it uses less digits than its factorization.

20121133120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5716259 (or 5716249 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20121133120 its reverse (2133112102), we get a palindrome (22254245222).

The spelling of 20121133120 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-three thousand, one hundred twenty".