210121021101121 has 8 divisors (see below), whose sum is σ = 226286757976104. Its totient is φ = 193955652998400.

The previous prime is 210121021101113. The next prime is 210121021101157. The reversal of 210121021101121 is 121101120121012.

It can be written as a sum of positive squares in 4 ways, for example, as 48742235886096 + 161378785215025 = 6981564^2 + 12703495^2 .

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 210121021101121 - 2³ = 210121021101113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210121021101095 and 210121021101104.

It is not an unprimeable number, because it can be changed into a prime (210121021101181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91009096 + ... + 93289321.

It is an arithmetic number, because the mean of its divisors is an integer number (28285844747013).

Almost surely, 2^{210121021101121} is an apocalyptic number.

It is an amenable number.

210121021101121 is a deficient number, since it is larger than the sum of its proper divisors (16165736874983).

210121021101121 is a wasteful number, since it uses less digits than its factorization.

210121021101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184386131.

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

Adding to 210121021101121 its reverse (121101120121012), we get a palindrome (331222141222133).

The spelling of 210121021101121 in words is "two hundred ten trillion, one hundred twenty-one billion, twenty-one million, one hundred one thousand, one hundred twenty-one".