10121000121 has 6 divisors (see below), whose sum is σ = 14619222410. Its totient is φ = 6747333408.

The previous prime is 10121000093. The next prime is 10121000129. The reversal of 10121000121 is 12100012101.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9762428025 + 358572096 = 98805^2 + 18936^2 .

It is not a de Polignac number, because 10121000121 - 2¹¹ = 10120998073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1124555569 = 10121000121 / (1 + 0 + 1 + 2 + 1 + 0 + 0 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10121000129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562277776 + ... + 562277793.

Almost surely, 2^10121000121 is an apocalyptic number.

It is an amenable number.

10121000121 is a deficient number, since it is larger than the sum of its proper divisors (4498222289).

10121000121 is a wasteful number, since it uses less digits than its factorization.

10121000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124555575 (or 1124555572 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10121000121 its reverse (12100012101), we get a palindrome (22221012222).

The spelling of 10121000121 in words is "ten billion, one hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.