20121211120 has 40 divisors (see below), whose sum is σ = 47548742400. Its totient is φ = 7916540160.

The previous prime is 20121211087. The next prime is 20121211139. The reversal of 20121211120 is 2111212102.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20121211120² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20121211120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2056720 + ... + 2066479.

It is an arithmetic number, because the mean of its divisors is an integer number (1188718560).

Almost surely, 2^20121211120 is an apocalyptic number.

20121211120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121211120 is an abundant number, since it is smaller than the sum of its proper divisors (27427531280).

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

20121211120 is a wasteful number, since it uses less digits than its factorization.

20121211120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123273 (or 4123267 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121211120 its reverse (2111212102), we get a palindrome (22232423222).

The spelling of 20121211120 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty".