12121021012 has 12 divisors (see below), whose sum is σ = 22459539060. Its totient is φ = 5704009856.

The previous prime is 12121021007. The next prime is 12121021021. The reversal of 12121021012 is 21012012121.

It can be written as a sum of positive squares in 2 ways, for example, as 10798535056 + 1322485956 = 103916^2 + 36366^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12121020983 and 12121021001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89125087 + ... + 89125222.

It is an arithmetic number, because the mean of its divisors is an integer number (1871628255).

Almost surely, 2^12121021012 is an apocalyptic number.

It is an amenable number.

12121021012 is a deficient number, since it is larger than the sum of its proper divisors (10338518048).

12121021012 is a wasteful number, since it uses less digits than its factorization.

12121021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178250330 (or 178250328 counting only the distinct ones).

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

Adding to 12121021012 its reverse (21012012121), we get a palindrome (33133033133).

The spelling of 12121021012 in words is "twelve billion, one hundred twenty-one million, twenty-one thousand, twelve".