10121223121 has 4 divisors (see below), whose sum is σ = 10121506612. Its totient is φ = 10120939632.

The previous prime is 10121223103. The next prime is 10121223137. The reversal of 10121223121 is 12132212101.

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 3630665025 + 6490558096 = 60255^2 + 80564^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121223121 - 2²¹ = 10119125969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121223095 and 10121223104.

It is not an unprimeable number, because it can be changed into a prime (10121223181) 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, 78906 + ... + 162691.

It is an arithmetic number, because the mean of its divisors is an integer number (2530376653).

Almost surely, 2^10121223121 is an apocalyptic number.

It is an amenable number.

10121223121 is a deficient number, since it is larger than the sum of its proper divisors (283491).

10121223121 is an equidigital number, since it uses as much as digits as its factorization.

10121223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283490.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 10121223121 its reverse (12132212101), we get a palindrome (22253435222).

The spelling of 10121223121 in words is "ten billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-one".