212000120021 has 4 divisors (see below), whose sum is σ = 212002968012. Its totient is φ = 211997272032.

The previous prime is 212000119963. The next prime is 212000120023. The reversal of 212000120021 is 120021000212.

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 136655908900 + 75344211121 = 369670^2 + 274489^2 .

It is a cyclic number.

It is not a de Polignac number, because 212000120021 - 2³⁰ = 210926378197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212000119984 and 212000120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212000120023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309256 + ... + 1462241.

It is an arithmetic number, because the mean of its divisors is an integer number (53000742003).

Almost surely, 2^212000120021 is an apocalyptic number.

It is an amenable number.

212000120021 is a deficient number, since it is larger than the sum of its proper divisors (2847991).

212000120021 is an equidigital number, since it uses as much as digits as its factorization.

212000120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847990.

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

Adding to 212000120021 its reverse (120021000212), we get a palindrome (332021120233).

The spelling of 212000120021 in words is "two hundred twelve billion, one hundred twenty thousand, twenty-one".