20121001012 has 48 divisors (see below), whose sum is σ = 40732876800. Its totient is φ = 8518740192.

The previous prime is 20121000989. The next prime is 20121001027. The reversal of 20121001012 is 21010012102.

It is a self number, because there is not a number n which added to its sum of digits gives 20121001012.

It is a congruent number.

It is an unprimeable number.

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, 748989 + ... + 775387.

It is an arithmetic number, because the mean of its divisors is an integer number (848601600).

Almost surely, 2^20121001012 is an apocalyptic number.

It is an amenable number.

20121001012 is an abundant number, since it is smaller than the sum of its proper divisors (20611875788).

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

20121001012 is a wasteful number, since it uses less digits than its factorization.

20121001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26740 (or 26738 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20121001012 its reverse (21010012102), we get a palindrome (41131013114).

The spelling of 20121001012 in words is "twenty billion, one hundred twenty-one million, one thousand, twelve".