210021022120221 has 36 divisors (see below), whose sum is σ = 339247491744252. Its totient is φ = 129243705867648.

The previous prime is 210021022120211. The next prime is 210021022120223. The reversal of 210021022120221 is 122021220120012.

It is a happy number.

210021022120221 is a `hidden beast` number, since 2 + 10 + 0 + 210 + 221 + 2 + 0 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 48278330924121 + 161742691196100 = 6948261^2 + 12717810^2 .

It is not a de Polignac number, because 210021022120221 - 2¹³ = 210021022112029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210021022120194 and 210021022120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021022120223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1231088556 + ... + 1231259141.

Almost surely, 2^{210021022120221} is an apocalyptic number.

It is an amenable number.

210021022120221 is a deficient number, since it is larger than the sum of its proper divisors (129226469624031).

210021022120221 is an frugal number, since it uses more digits than its factorization.

210021022120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462347734 (or 2462347713 counting only the distinct ones).

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

Adding to 210021022120221 its reverse (122021220120012), we get a palindrome (332042242240233).

The spelling of 210021022120221 in words is "two hundred ten trillion, twenty-one billion, twenty-two million, one hundred twenty thousand, two hundred twenty-one".