210101212121121 has 6 divisors (see below), whose sum is σ = 303479528619410. Its totient is φ = 140067474747408.

The previous prime is 210101212121117. The next prime is 210101212121179. The reversal of 210101212121121 is 121121212101012.

It is a happy number.

210101212121121 is a `hidden beast` number, since 210 + 1 + 0 + 1 + 212 + 121 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 180054424686096 + 30046787435025 = 13418436^2 + 5481495^2 .

It is not a de Polignac number, because 210101212121121 - 2² = 210101212121117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210101212121094 and 210101212121103.

It is not an unprimeable number, because it can be changed into a prime (210101212121321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11672289562276 + ... + 11672289562293.

Almost surely, 2^{210101212121121} is an apocalyptic number.

It is an amenable number.

210101212121121 is a deficient number, since it is larger than the sum of its proper divisors (93378316498289).

210101212121121 is a wasteful number, since it uses less digits than its factorization.

210101212121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23344579124575 (or 23344579124572 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 210101212121121 its reverse (121121212101012), we get a palindrome (331222424222133).

The spelling of 210101212121121 in words is "two hundred ten trillion, one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".