12021131220989 has 24 divisors (see below), whose sum is σ = 13674672039000. Its totient is φ = 10547039099520.

The previous prime is 12021131220977. The next prime is 12021131221009. The reversal of 12021131220989 is 98902213112021.

It can be written as a sum of positive squares in 4 ways, for example, as 1787261503225 + 10233869717764 = 1336885^2 + 3199042^2 .

It is not a de Polignac number, because 12021131220989 - 2²⁰ = 12021130172413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021131220919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7666007 + ... + 9099995.

It is an arithmetic number, because the mean of its divisors is an integer number (569778001625).

Almost surely, 2^{12021131220989} is an apocalyptic number.

It is an amenable number.

12021131220989 is a deficient number, since it is larger than the sum of its proper divisors (1653540818011).

12021131220989 is a wasteful number, since it uses less digits than its factorization.

12021131220989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436429 (or 1436418 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The spelling of 12021131220989 in words is "twelve trillion, twenty-one billion, one hundred thirty-one million, two hundred twenty thousand, nine hundred eighty-nine".