210221002120221 has 12 divisors (see below), whose sum is σ = 303661114841760. Its totient is φ = 140143385720520.

The previous prime is 210221002120193. The next prime is 210221002120249. The reversal of 210221002120221 is 122021200122012.

It is a happy number.

210221002120221 is a `hidden beast` number, since 2 + 10 + 221 + 0 + 0 + 212 + 0 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (210221002120193) and next prime (210221002120249).

It is not a de Polignac number, because 210221002120221 - 2⁷ = 210221002120093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221002120194 and 210221002120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221002220221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328748361 + ... + 329387198.

It is an arithmetic number, because the mean of its divisors is an integer number (25305092903480).

Almost surely, 2^{210221002120221} is an apocalyptic number.

It is an amenable number.

210221002120221 is a deficient number, since it is larger than the sum of its proper divisors (93440112721539).

210221002120221 is a wasteful number, since it uses less digits than its factorization.

210221002120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658171056 (or 658171053 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210221002120221 its reverse (122021200122012), we get a palindrome (332242202242233).

The spelling of 210221002120221 in words is "two hundred ten trillion, two hundred twenty-one billion, two million, one hundred twenty thousand, two hundred twenty-one".