20210211210121 has 8 divisors (see below), whose sum is σ = 20274562612040. Its totient is φ = 20145914186112.

The previous prime is 20210211210097. The next prime is 20210211210149. The reversal of 20210211210121 is 12101211201202.

It can be written as a sum of positive squares in 4 ways, for example, as 686503388025 + 19523707822096 = 828555^2 + 4418564^2 .

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 20210211210121 - 2¹¹ = 20210211208073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210211210095 and 20210211210104.

It is not an unprimeable number, because it can be changed into a prime (20210211210181) 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, 12849906 + ... + 14336683.

It is an arithmetic number, because the mean of its divisors is an integer number (2534320326505).

Almost surely, 2^{20210211210121} is an apocalyptic number.

It is an amenable number.

20210211210121 is a deficient number, since it is larger than the sum of its proper divisors (64351401919).

20210211210121 is a wasteful number, since it uses less digits than its factorization.

20210211210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27188955.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20210211210121 its reverse (12101211201202), we get a palindrome (32311422411323).

The spelling of 20210211210121 in words is "twenty trillion, two hundred ten billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-one".