212002000021 has 48 divisors (see below), whose sum is σ = 251507566080. Its totient is φ = 178156752480.

The previous prime is 212001999961. The next prime is 212002000031. The reversal of 212002000021 is 120000200212.

212002000021 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 212002000021 - 2⁷ = 212001999893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212001999971 and 212002000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212002000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 306804286 + ... + 306804976.

It is an arithmetic number, because the mean of its divisors is an integer number (5239740960).

Almost surely, 2^212002000021 is an apocalyptic number.

It is an amenable number.

212002000021 is a deficient number, since it is larger than the sum of its proper divisors (39505566059).

212002000021 is a wasteful number, since it uses less digits than its factorization.

212002000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 212002000021 its reverse (120000200212), we get a palindrome (332002200233).

The spelling of 212002000021 in words is "two hundred twelve billion, two million, twenty-one", and thus it is an aban number.