210021201022221 has 32 divisors (see below), whose sum is σ = 316307103978240. Its totient is φ = 137690998632000.

The previous prime is 210021201022201. The next prime is 210021201022277. The reversal of 210021201022221 is 122220102120012.

It is a happy number.

210021201022221 is a `hidden beast` number, since 210 + 0 + 212 + 0 + 1 + 0 + 22 + 221 = 666.

210021201022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210021201022221 - 2²³ = 210021192633613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210021201022194 and 210021201022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021201022201) 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, 4723650 + ... + 21032243.

It is an arithmetic number, because the mean of its divisors is an integer number (9884596999320).

Almost surely, 2^{210021201022221} is an apocalyptic number.

It is an amenable number.

210021201022221 is a deficient number, since it is larger than the sum of its proper divisors (106285902956019).

210021201022221 is a wasteful number, since it uses less digits than its factorization.

210021201022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25760914 (or 25760908 counting only the distinct ones).

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

Adding to 210021201022221 its reverse (122220102120012), we get a palindrome (332241303142233).

The spelling of 210021201022221 in words is "two hundred ten trillion, twenty-one billion, two hundred one million, twenty-two thousand, two hundred twenty-one".