212102103221 has 4 divisors (see below), whose sum is σ = 212106242412. Its totient is φ = 212097964032.

The previous prime is 212102103203. The next prime is 212102103223. The reversal of 212102103221 is 122301201212.

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 14509407025 + 197592696196 = 120455^2 + 444514^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102103221 - 2¹⁴ = 212102086837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212102103221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102103223) 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, 1991756 + ... + 2095541.

It is an arithmetic number, because the mean of its divisors is an integer number (53026560603).

Almost surely, 2^212102103221 is an apocalyptic number.

It is an amenable number.

212102103221 is a deficient number, since it is larger than the sum of its proper divisors (4139191).

212102103221 is an equidigital number, since it uses as much as digits as its factorization.

212102103221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139190.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212102103221 its reverse (122301201212), we get a palindrome (334403304433).

The spelling of 212102103221 in words is "two hundred twelve billion, one hundred two million, one hundred three thousand, two hundred twenty-one".