210021100220221 has 4 divisors (see below), whose sum is σ = 210061652668000. Its totient is φ = 209980547772444.

The previous prime is 210021100220219. The next prime is 210021100220257. The reversal of 210021100220221 is 122022001120012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210021100220221 - 2¹ = 210021100220219 is a prime.

It is a super-2 number, since 2×210021100220221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021100220195 and 210021100220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021100220621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20276216121 + ... + 20276226478.

It is an arithmetic number, because the mean of its divisors is an integer number (52515413167000).

Almost surely, 2^{210021100220221} is an apocalyptic number.

It is an amenable number.

210021100220221 is a deficient number, since it is larger than the sum of its proper divisors (40552447779).

210021100220221 is an equidigital number, since it uses as much as digits as its factorization.

210021100220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40552447778.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210021100220221 its reverse (122022001120012), we get a palindrome (332043101340233).

The spelling of 210021100220221 in words is "two hundred ten trillion, twenty-one billion, one hundred million, two hundred twenty thousand, two hundred twenty-one".