10001100121 has 4 divisors (see below), whose sum is σ = 10165052644. Its totient is φ = 9837147600.

The previous prime is 10001100113. The next prime is 10001100149. The reversal of 10001100121 is 12100110001.

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 1314860121 + 8686240000 = 36261^2 + 93200^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001100121 - 2³ = 10001100113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001100121) 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, 81976170 + ... + 81976291.

It is an arithmetic number, because the mean of its divisors is an integer number (2541263161).

Almost surely, 2^10001100121 is an apocalyptic number.

It is an amenable number.

10001100121 is a deficient number, since it is larger than the sum of its proper divisors (163952523).

10001100121 is an equidigital number, since it uses as much as digits as its factorization.

10001100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163952522.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 10001100121 its reverse (12100110001), we get a palindrome (22101210122).

The spelling of 10001100121 in words is "ten billion, one million, one hundred thousand, one hundred twenty-one".