210212021220221 has 4 divisors (see below), whose sum is σ = 210690864093600. Its totient is φ = 209733178346844.

The previous prime is 210212021220217. The next prime is 210212021220239. The reversal of 210212021220221 is 122022120212012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210212021220221 - 2² = 210212021220217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210212021220193 and 210212021220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210212021225221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239421436031 + ... + 239421436908.

It is an arithmetic number, because the mean of its divisors is an integer number (52672716023400).

Almost surely, 2^{210212021220221} is an apocalyptic number.

It is an amenable number.

210212021220221 is a deficient number, since it is larger than the sum of its proper divisors (478842873379).

210212021220221 is an equidigital number, since it uses as much as digits as its factorization.

210212021220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478842873378.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 210212021220221 its reverse (122022120212012), we get a palindrome (332234141432233).

The spelling of 210212021220221 in words is "two hundred ten trillion, two hundred twelve billion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".