2012121021209 has 16 divisors (see below), whose sum is σ = 2191901659920. Its totient is φ = 1835971737600.

The previous prime is 2012121021193. The next prime is 2012121021217. The reversal of 2012121021209 is 9021201212102.

It can be written as a sum of positive squares in 8 ways, for example, as 192177024400 + 1819943996809 = 438380^2 + 1349053^2 .

It is not a de Polignac number, because 2012121021209 - 2⁴ = 2012121021193 is a prime.

It is a super-2 number, since 2×2012121021209² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2012121021299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431744 + ... + 2051985.

It is an arithmetic number, because the mean of its divisors is an integer number (136993853745).

Almost surely, 2^{2012121021209} is an apocalyptic number.

It is an amenable number.

2012121021209 is a deficient number, since it is larger than the sum of its proper divisors (179780638711).

2012121021209 is a wasteful number, since it uses less digits than its factorization.

2012121021209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484460.

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

The spelling of 2012121021209 in words is "two trillion, twelve billion, one hundred twenty-one million, twenty-one thousand, two hundred nine".