20012121120 has 48 divisors (see below), whose sum is σ = 63038183040. Its totient is φ = 5336565504.

The previous prime is 20012121109. The next prime is 20012121137. The reversal of 20012121120 is 2112121002.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20012121096 and 20012121105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20845480 + ... + 20846439.

It is an arithmetic number, because the mean of its divisors is an integer number (1313295480).

Almost surely, 2^20012121120 is an apocalyptic number.

20012121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012121120 is an abundant number, since it is smaller than the sum of its proper divisors (43026061920).

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

20012121120 is a wasteful number, since it uses less digits than its factorization.

20012121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41691937 (or 41691929 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20012121120 its reverse (2112121002), we get a palindrome (22124242122).

The spelling of 20012121120 in words is "twenty billion, twelve million, one hundred twenty-one thousand, one hundred twenty".