121021020012 has 24 divisors (see below), whose sum is σ = 282459405312. Its totient is φ = 40329336400.

The previous prime is 121021019947. The next prime is 121021020019. The reversal of 121021020012 is 210020120121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121021020012.

It is not an unprimeable number, because it can be changed into a prime (121021020019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329564 + ... + 1417667.

It is an arithmetic number, because the mean of its divisors is an integer number (11769141888).

Almost surely, 2^121021020012 is an apocalyptic number.

121021020012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121021020012 is an abundant number, since it is smaller than the sum of its proper divisors (161438385300).

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

121021020012 is a wasteful number, since it uses less digits than its factorization.

121021020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750909 (or 2750907 counting only the distinct ones).

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

Adding to 121021020012 its reverse (210020120121), we get a palindrome (331041140133).

The spelling of 121021020012 in words is "one hundred twenty-one billion, twenty-one million, twenty thousand, twelve".