212102000021 has 8 divisors (see below), whose sum is σ = 224687338080. Its totient is φ = 199658869488.

The previous prime is 212102000009. The next prime is 212102000069. The reversal of 212102000021 is 120000201212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212102000021 - 2⁶ = 212101999957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212101999966 and 212102000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102000221) 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, 35548811 + ... + 35554776.

It is an arithmetic number, because the mean of its divisors is an integer number (28085917260).

Almost surely, 2^212102000021 is an apocalyptic number.

It is an amenable number.

212102000021 is a deficient number, since it is larger than the sum of its proper divisors (12585338059).

212102000021 is a wasteful number, since it uses less digits than its factorization.

212102000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71103763.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 212102000021 its reverse (120000201212), we get a palindrome (332102201233).

The spelling of 212102000021 in words is "two hundred twelve billion, one hundred two million, twenty-one", and thus it is an aban number.