212100002021 has 8 divisors (see below), whose sum is σ = 217726790400. Its totient is φ = 206494814560.

The previous prime is 212100001987. The next prime is 212100002029. The reversal of 212100002021 is 120200001212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212100002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212100001993 and 212100002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100002029) 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, 5380331 + ... + 5419608.

It is an arithmetic number, because the mean of its divisors is an integer number (27215848800).

Almost surely, 2^212100002021 is an apocalyptic number.

It is an amenable number.

212100002021 is a deficient number, since it is larger than the sum of its proper divisors (5626788379).

212100002021 is a wasteful number, since it uses less digits than its factorization.

212100002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10800459.

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

Adding to 212100002021 its reverse (120200001212), we get a palindrome (332300003233).

The spelling of 212100002021 in words is "two hundred twelve billion, one hundred million, two thousand, twenty-one".