12020020211989 has 4 divisors (see below), whose sum is σ = 12020228038156. Its totient is φ = 12019812385824.

The previous prime is 12020020211957. The next prime is 12020020211999. The reversal of 12020020211989 is 98911202002021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 811197442225 + 11208822769764 = 900665^2 + 3347958^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020020211989 - 2⁵ = 12020020211957 is a prime.

It is a super-2 number, since 2×12020020211989² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020020211999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103826304 + ... + 103942009.

It is an arithmetic number, because the mean of its divisors is an integer number (3005057009539).

Almost surely, 2^{12020020211989} is an apocalyptic number.

It is an amenable number.

12020020211989 is a deficient number, since it is larger than the sum of its proper divisors (207826167).

12020020211989 is an equidigital number, since it uses as much as digits as its factorization.

12020020211989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207826166.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 12020020211989 in words is "twelve trillion, twenty billion, twenty million, two hundred eleven thousand, nine hundred eighty-nine".