210221102222021 has 4 divisors (see below), whose sum is σ = 229332111514944. Its totient is φ = 191110092929100.

The previous prime is 210221102222011. The next prime is 210221102222041. The reversal of 210221102222021 is 120222201122012.

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 210221102222021 - 2³⁰ = 210220028480197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221102221984 and 210221102222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221102222011) 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, 9555504646445 + ... + 9555504646466.

It is an arithmetic number, because the mean of its divisors is an integer number (57333027878736).

Almost surely, 2^{210221102222021} is an apocalyptic number.

It is an amenable number.

210221102222021 is a deficient number, since it is larger than the sum of its proper divisors (19111009292923).

210221102222021 is a wasteful number, since it uses less digits than its factorization.

210221102222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19111009292922.

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

Adding to 210221102222021 its reverse (120222201122012), we get a palindrome (330443303344033).

The spelling of 210221102222021 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty-two thousand, twenty-one".