121001100013 has 4 divisors (see below), whose sum is σ = 121171765180. Its totient is φ = 120830434848.

The previous prime is 121001100001. The next prime is 121001100049. The reversal of 121001100013 is 310001100121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310001100121 = 23689 ⋅13086289.

It can be written as a sum of positive squares in 2 ways, for example, as 32031334729 + 88969765284 = 178973^2 + 298278^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001100013 - 2²⁹ = 120464229101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001100113) 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, 85331520 + ... + 85332937.

It is an arithmetic number, because the mean of its divisors is an integer number (30292941295).

Almost surely, 2^121001100013 is an apocalyptic number.

It is an amenable number.

121001100013 is a deficient number, since it is larger than the sum of its proper divisors (170665167).

121001100013 is an equidigital number, since it uses as much as digits as its factorization.

121001100013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170665166.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 121001100013 its reverse (310001100121), we get a palindrome (431002200134).

The spelling of 121001100013 in words is "one hundred twenty-one billion, one million, one hundred thousand, thirteen".