2121003144345 has 32 divisors (see below), whose sum is σ = 3541352804352. Its totient is φ = 1081957967552.

The previous prime is 2121003144343. The next prime is 2121003144347. The reversal of 2121003144345 is 5434413001212.

It is an interprime number because it is at equal distance from previous prime (2121003144343) and next prime (2121003144347).

It is a cyclic number.

It is not a de Polignac number, because 2121003144345 - 2¹ = 2121003144343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121003144343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6302332 + ... + 6630338.

It is an arithmetic number, because the mean of its divisors is an integer number (110667275136).

Almost surely, 2^{2121003144345} is an apocalyptic number.

It is an amenable number.

2121003144345 is a deficient number, since it is larger than the sum of its proper divisors (1420349660007).

2121003144345 is a wasteful number, since it uses less digits than its factorization.

2121003144345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346781.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 2121003144345 its reverse (5434413001212), we get a palindrome (7555416145557).

The spelling of 2121003144345 in words is "two trillion, one hundred twenty-one billion, three million, one hundred forty-four thousand, three hundred forty-five".