212102303221 has 4 divisors (see below), whose sum is σ = 212103643500. Its totient is φ = 212100962944.

The previous prime is 212102303209. The next prime is 212102303243. The reversal of 212102303221 is 122303201212.

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 109180680625 + 102921622596 = 330425^2 + 320814^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102303221 - 2⁷ = 212102303093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102303201) 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, 395146 + ... + 761803.

It is an arithmetic number, because the mean of its divisors is an integer number (53025910875).

Almost surely, 2^212102303221 is an apocalyptic number.

It is an amenable number.

212102303221 is a deficient number, since it is larger than the sum of its proper divisors (1340279).

212102303221 is a wasteful number, since it uses less digits than its factorization.

212102303221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340278.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212102303221 its reverse (122303201212), we get a palindrome (334405504433).

The spelling of 212102303221 in words is "two hundred twelve billion, one hundred two million, three hundred three thousand, two hundred twenty-one".