2100428403245 has 4 divisors (see below), whose sum is σ = 2520514083900. Its totient is φ = 1680342722592.

The previous prime is 2100428403209. The next prime is 2100428403247. The reversal of 2100428403245 is 5423048240012.

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 561176279689 + 1539252123556 = 749117^2 + 1240666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100428403245 - 2¹² = 2100428399149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100428403247) 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, 210042840320 + ... + 210042840329.

It is an arithmetic number, because the mean of its divisors is an integer number (630128520975).

Almost surely, 2^{2100428403245} is an apocalyptic number.

It is an amenable number.

2100428403245 is a deficient number, since it is larger than the sum of its proper divisors (420085680655).

2100428403245 is an equidigital number, since it uses as much as digits as its factorization.

2100428403245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420085680654.

The product of its (nonzero) digits is 61440, while the sum is 35.

The spelling of 2100428403245 in words is "two trillion, one hundred billion, four hundred twenty-eight million, four hundred three thousand, two hundred forty-five".