12021210121020 has 48 divisors (see below), whose sum is σ = 33660213595008. Its totient is φ = 3205577436480.

The previous prime is 12021210120991. The next prime is 12021210121033. The reversal of 12021210121020 is 2012101212021.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 32307 + ... + 4903413.

It is an arithmetic number, because the mean of its divisors is an integer number (701254449896).

Almost surely, 2^{12021210121020} is an apocalyptic number.

12021210121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021210121020 is an abundant number, since it is smaller than the sum of its proper divisors (21639003473988).

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

12021210121020 is a wasteful number, since it uses less digits than its factorization.

12021210121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4912250 (or 4912248 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12021210121020 its reverse (2012101212021), we get a palindrome (14033311333041).

The spelling of 12021210121020 in words is "twelve trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, twenty".