210021122220221 has 32 divisors (see below), whose sum is σ = 241341330843648. Its totient is φ = 181049282472960.

The previous prime is 210021122220157. The next prime is 210021122220227. The reversal of 210021122220221 is 122022221120012.

210021122220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 210021122220221 - 2⁶ = 210021122220157 is a prime.

It is a super-4 number, since 4×210021122220221⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021122220193 and 210021122220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021122220227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10491386 + ... + 23024148.

It is an arithmetic number, because the mean of its divisors is an integer number (7541916588864).

Almost surely, 2^{210021122220221} is an apocalyptic number.

It is an amenable number.

210021122220221 is a deficient number, since it is larger than the sum of its proper divisors (31320208623427).

210021122220221 is a wasteful number, since it uses less digits than its factorization.

210021122220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12533381.

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

Adding to 210021122220221 its reverse (122022221120012), we get a palindrome (332043343340233).

The spelling of 210021122220221 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".