211210202122121 has 8 divisors (see below), whose sum is σ = 215871288542784. Its totient is φ = 206599505825200.

The previous prime is 211210202122109. The next prime is 211210202122123. The reversal of 211210202122121 is 121221202012112.

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 211210202122121 - 2⁶ = 211210202122057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211210202122093 and 211210202122102.

It is not an unprimeable number, because it can be changed into a prime (211210202122123) 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, 12597522461 + ... + 12597539226.

It is an arithmetic number, because the mean of its divisors is an integer number (26983911067848).

Almost surely, 2^{211210202122121} is an apocalyptic number.

It is an amenable number.

211210202122121 is a deficient number, since it is larger than the sum of its proper divisors (4661086420663).

211210202122121 is a wasteful number, since it uses less digits than its factorization.

211210202122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25195061871.

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

Adding to 211210202122121 its reverse (121221202012112), we get a palindrome (332431404134233).

The spelling of 211210202122121 in words is "two hundred eleven trillion, two hundred ten billion, two hundred two million, one hundred twenty-two thousand, one hundred twenty-one".