20212012121009 has 4 divisors (see below), whose sum is σ = 20217257910516. Its totient is φ = 20206766331504.

The previous prime is 20212012120997. The next prime is 20212012121017. The reversal of 20212012121009 is 90012121021202.

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 18258768288784 + 1953243832225 = 4273028^2 + 1397585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212012121009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212012121099) 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, 2622888974 + ... + 2622896679.

It is an arithmetic number, because the mean of its divisors is an integer number (5054314477629).

Almost surely, 2^{20212012121009} is an apocalyptic number.

It is an amenable number.

20212012121009 is a deficient number, since it is larger than the sum of its proper divisors (5245789507).

20212012121009 is an equidigital number, since it uses as much as digits as its factorization.

20212012121009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5245789506.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 20212012121009 in words is "twenty trillion, two hundred twelve billion, twelve million, one hundred twenty-one thousand, nine".