210021122122121 has 8 divisors (see below), whose sum is σ = 216157959624384. Its totient is φ = 203972584440240.

The previous prime is 210021122122093. The next prime is 210021122122213. The reversal of 210021122122121 is 121221221120012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210021122122121 - 2⁶ = 210021122122057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021122122093 and 210021122122102.

It is not an unprimeable number, because it can be changed into a prime (210021122122621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22074950270 + ... + 22074959783.

It is an arithmetic number, because the mean of its divisors is an integer number (27019744953048).

Almost surely, 2^{210021122122121} is an apocalyptic number.

It is an amenable number.

210021122122121 is a deficient number, since it is larger than the sum of its proper divisors (6136837502263).

210021122122121 is an equidigital number, since it uses as much as digits as its factorization.

210021122122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44149910191.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 210021122122121 its reverse (121221221120012), we get a palindrome (331242343242133).

The spelling of 210021122122121 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".