212001021009 has 8 divisors (see below), whose sum is σ = 314075586720. Its totient is φ = 141334013988.

The previous prime is 212001021007. The next prime is 212001021017. The reversal of 212001021009 is 900120100212.

It is not a de Polignac number, because 212001021009 - 2¹ = 212001021007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212001020982 and 212001021000.

It is not an unprimeable number, because it can be changed into a prime (212001021007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3925944807 + ... + 3925944860.

It is an arithmetic number, because the mean of its divisors is an integer number (39259448340).

Almost surely, 2^212001021009 is an apocalyptic number.

It is an amenable number.

212001021009 is a deficient number, since it is larger than the sum of its proper divisors (102074565711).

212001021009 is an equidigital number, since it uses as much as digits as its factorization.

212001021009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851889676 (or 7851889670 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 212001021009 in words is "two hundred twelve billion, one million, twenty-one thousand, nine".