1000212121209 has 16 divisors (see below), whose sum is σ = 1539223182720. Its totient is φ = 565890873600.

The previous prime is 1000212121189. The next prime is 1000212121243. The reversal of 1000212121209 is 9021212120001.

1000212121209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1000212121209 - 2⁵ = 1000212121177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1000212121289) 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, 235785744 + ... + 235789985.

It is an arithmetic number, because the mean of its divisors is an integer number (96201448920).

Almost surely, 2^{1000212121209} is an apocalyptic number.

It is an amenable number.

1000212121209 is a deficient number, since it is larger than the sum of its proper divisors (539011061511).

1000212121209 is a wasteful number, since it uses less digits than its factorization.

1000212121209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471575840.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 1000212121209 in words is "one trillion, two hundred twelve million, one hundred twenty-one thousand, two hundred nine".