202012102312121 has 4 divisors (see below), whose sum is σ = 202019687368692. Its totient is φ = 202004517255552.

The previous prime is 202012102312099. The next prime is 202012102312133. The reversal of 202012102312121 is 121213201210202.

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 164779223796496 + 37232878515625 = 12836636^2 + 6101875^2 .

It is a cyclic number.

It is not a de Polignac number, because 202012102312121 - 2¹⁴ = 202012102295737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202012102312093 and 202012102312102.

It is not an unprimeable number, because it can be changed into a prime (202012152312121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3792488336 + ... + 3792541601.

It is an arithmetic number, because the mean of its divisors is an integer number (50504921842173).

Almost surely, 2^{202012102312121} is an apocalyptic number.

It is an amenable number.

202012102312121 is a deficient number, since it is larger than the sum of its proper divisors (7585056571).

202012102312121 is an equidigital number, since it uses as much as digits as its factorization.

202012102312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7585056570.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 202012102312121 its reverse (121213201210202), we get a palindrome (323225303522323).

The spelling of 202012102312121 in words is "two hundred two trillion, twelve billion, one hundred two million, three hundred twelve thousand, one hundred twenty-one".