20120210202121 has 4 divisors (see below), whose sum is σ = 20122512031044. Its totient is φ = 20117908373200.

The previous prime is 20120210202089. The next prime is 20120210202139. The reversal of 20120210202121 is 12120201202102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1129832940096 + 18990377262025 = 1062936^2 + 4357795^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120210202121 - 2⁵ = 20120210202089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120210202095 and 20120210202104.

It is not an unprimeable number, because it can be changed into a prime (20120210202221) 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 3 ways as a sum of consecutive naturals, for example, 1150901350 + ... + 1150918831.

It is an arithmetic number, because the mean of its divisors is an integer number (5030628007761).

Almost surely, 2^{20120210202121} is an apocalyptic number.

It is an amenable number.

20120210202121 is a deficient number, since it is larger than the sum of its proper divisors (2301828923).

20120210202121 is an equidigital number, since it uses as much as digits as its factorization.

20120210202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301828922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20120210202121 its reverse (12120201202102), we get a palindrome (32240411404223).

The spelling of 20120210202121 in words is "twenty trillion, one hundred twenty billion, two hundred ten million, two hundred two thousand, one hundred twenty-one".