2540021004509 has 4 divisors (see below), whose sum is σ = 2540025554304. Its totient is φ = 2540016454716.

The previous prime is 2540021004491. The next prime is 2540021004523. The reversal of 2540021004509 is 9054001200452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2540021004509 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 (2540021054509) 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, 1297517 + ... + 2600690.

It is an arithmetic number, because the mean of its divisors is an integer number (635006388576).

Almost surely, 2^{2540021004509} is an apocalyptic number.

It is an amenable number.

2540021004509 is a deficient number, since it is larger than the sum of its proper divisors (4549795).

2540021004509 is an equidigital number, since it uses as much as digits as its factorization.

2540021004509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549794.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 2540021004509 in words is "two trillion, five hundred forty billion, twenty-one million, four thousand, five hundred nine".