212122201021 has 4 divisors (see below), whose sum is σ = 212751644092. Its totient is φ = 211492757952.

The previous prime is 212122201003. The next prime is 212122201043. The reversal of 212122201021 is 120102221212.

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 16541560996 + 195580640025 = 128614^2 + 442245^2 .

It is a cyclic number.

It is not a de Polignac number, because 212122201021 - 2⁷ = 212122200893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212122200986 and 212122201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122201321) 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, 314721030 + ... + 314721703.

It is an arithmetic number, because the mean of its divisors is an integer number (53187911023).

Almost surely, 2^212122201021 is an apocalyptic number.

It is an amenable number.

212122201021 is a deficient number, since it is larger than the sum of its proper divisors (629443071).

212122201021 is an equidigital number, since it uses as much as digits as its factorization.

212122201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629443070.

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

Adding to 212122201021 its reverse (120102221212), we get a palindrome (332224422233).

The spelling of 212122201021 in words is "two hundred twelve billion, one hundred twenty-two million, two hundred one thousand, twenty-one".