10012000121 has 4 divisors (see below), whose sum is σ = 10013171700. Its totient is φ = 10010828544.

The previous prime is 10012000093. The next prime is 10012000127. The reversal of 10012000121 is 12100021001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12100021001 = 71 ⋅170422831.

It can be written as a sum of positive squares in 2 ways, for example, as 1225000000 + 8787000121 = 35000^2 + 93739^2 .

It is a cyclic number.

It is not a de Polignac number, because 10012000121 - 2¹⁰ = 10011999097 is a prime.

It is a super-3 number, since 3×10012000121³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10012000099 and 10012000108.

It is not an unprimeable number, because it can be changed into a prime (10012000127) 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, 572876 + ... + 590093.

It is an arithmetic number, because the mean of its divisors is an integer number (2503292925).

Almost surely, 2^10012000121 is an apocalyptic number.

It is an amenable number.

10012000121 is a deficient number, since it is larger than the sum of its proper divisors (1171579).

10012000121 is an equidigital number, since it uses as much as digits as its factorization.

10012000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171578.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 10012000121 its reverse (12100021001), we get a palindrome (22112021122).

The spelling of 10012000121 in words is "ten billion, twelve million, one hundred twenty-one", and thus it is an aban number.