20121122512 has 80 divisors (see below), whose sum is σ = 41709016960. Its totient is φ = 9376114176.

The previous prime is 20121122501. The next prime is 20121122533. The reversal of 20121122512 is 21522112102.

It is a happy number.

It is a super-2 number, since 2×20121122512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 20121122512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4913938 + ... + 4918030.

It is an arithmetic number, because the mean of its divisors is an integer number (521362712).

Almost surely, 2^20121122512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121122512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20854508480).

20121122512 is an abundant number, since it is smaller than the sum of its proper divisors (21587894448).

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

20121122512 is a wasteful number, since it uses less digits than its factorization.

20121122512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380 (or 4374 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 20121122512 its reverse (21522112102), we get a palindrome (41643234614).

The spelling of 20121122512 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, five hundred twelve".