12000121020 has 36 divisors (see below), whose sum is σ = 36400367640. Its totient is φ = 3200032224.

The previous prime is 12000120931. The next prime is 12000121031. The reversal of 12000121020 is 2012100021.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12000120993 and 12000121011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33333490 + ... + 33333849.

Almost surely, 2^12000121020 is an apocalyptic number.

12000121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12000121020 is an abundant number, since it is smaller than the sum of its proper divisors (24400246620).

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

12000121020 is a wasteful number, since it uses less digits than its factorization.

12000121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66667354 (or 66667349 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12000121020 its reverse (2012100021), we get a palindrome (14012221041).

The spelling of 12000121020 in words is "twelve billion, one hundred twenty-one thousand, twenty".