210121330221 has 48 divisors (see below), whose sum is σ = 333340757568. Its totient is φ = 126487468800.

The previous prime is 210121330183. The next prime is 210121330249. The reversal of 210121330221 is 122033121012.

210121330221 is a `hidden beast` number, since 210 + 121 + 330 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 210121330221 - 2⁷ = 210121330093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210121330194 and 210121330203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121330021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8806710 + ... + 8830536.

It is an arithmetic number, because the mean of its divisors is an integer number (6944599116).

Almost surely, 2^210121330221 is an apocalyptic number.

It is an amenable number.

210121330221 is a deficient number, since it is larger than the sum of its proper divisors (123219427347).

210121330221 is a wasteful number, since it uses less digits than its factorization.

210121330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24442 (or 24439 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 210121330221 its reverse (122033121012), we get a palindrome (332154451233).

The spelling of 210121330221 in words is "two hundred ten billion, one hundred twenty-one million, three hundred thirty thousand, two hundred twenty-one".