100120412345 has 4 divisors (see below), whose sum is σ = 120144494820. Its totient is φ = 80096329872.

The previous prime is 100120412341. The next prime is 100120412347. The reversal of 100120412345 is 543214021001.

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 73208666041 + 26911746304 = 270571^2 + 164048^2 .

It is a cyclic number.

It is not a de Polignac number, because 100120412345 - 2² = 100120412341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100120412345.

It is not an unprimeable number, because it can be changed into a prime (100120412341) 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, 10012041230 + ... + 10012041239.

It is an arithmetic number, because the mean of its divisors is an integer number (30036123705).

Almost surely, 2^100120412345 is an apocalyptic number.

It is an amenable number.

100120412345 is a deficient number, since it is larger than the sum of its proper divisors (20024082475).

100120412345 is an equidigital number, since it uses as much as digits as its factorization.

100120412345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20024082474.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 100120412345 its reverse (543214021001), we get a palindrome (643334433346).

The spelling of 100120412345 in words is "one hundred billion, one hundred twenty million, four hundred twelve thousand, three hundred forty-five".