12121110001 has 32 divisors (see below), whose sum is σ = 16327922688. Its totient is φ = 8689861440.

The previous prime is 12121109951. The next prime is 12121110061. The reversal of 12121110001 is 10001112121.

It is a de Polignac number, because none of the positive numbers 2^k-12121110001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121110001.

It is not an unprimeable number, because it can be changed into a prime (12121110061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287586 + ... + 327028.

It is an arithmetic number, because the mean of its divisors is an integer number (510247584).

Almost surely, 2^12121110001 is an apocalyptic number.

12121110001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12121110001 is a deficient number, since it is larger than the sum of its proper divisors (4206812687).

12121110001 is a wasteful number, since it uses less digits than its factorization.

12121110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39781.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 12121110001 its reverse (10001112121), we get a palindrome (22122222122).

The spelling of 12121110001 in words is "twelve billion, one hundred twenty-one million, one hundred ten thousand, one".