212120002021021 has 4 divisors (see below), whose sum is σ = 212130554750044. Its totient is φ = 212109449292000.

The previous prime is 212120002021013. The next prime is 212120002021051. The reversal of 212120002021021 is 120120200021212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56984532416100 + 155135469604921 = 7548810^2 + 12455339^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120002021021 - 2³ = 212120002021013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120002020986 and 212120002021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120002021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5276334360 + ... + 5276374561.

It is an arithmetic number, because the mean of its divisors is an integer number (53032638687511).

Almost surely, 2^{212120002021021} is an apocalyptic number.

It is an amenable number.

212120002021021 is a deficient number, since it is larger than the sum of its proper divisors (10552729023).

212120002021021 is a wasteful number, since it uses less digits than its factorization.

212120002021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10552729022.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212120002021021 its reverse (120120200021212), we get a palindrome (332240202042233).

The spelling of 212120002021021 in words is "two hundred twelve trillion, one hundred twenty billion, two million, twenty-one thousand, twenty-one".