2521404243 has 24 divisors (see below), whose sum is σ = 3685395168. Its totient is φ = 1661041152.

The previous prime is 2521404229. The next prime is 2521404247. The reversal of 2521404243 is 3424041252.

2521404243 is a `hidden beast` number, since 25 + 214 + 0 + 424 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-2521404243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2521404247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255171 + ... + 264867.

It is an arithmetic number, because the mean of its divisors is an integer number (153558132).

Almost surely, 2^2521404243 is an apocalyptic number.

2521404243 is a deficient number, since it is larger than the sum of its proper divisors (1163990925).

2521404243 is a wasteful number, since it uses less digits than its factorization.

2521404243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043 (or 10040 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 2521404243 is about 50213.5862391843. The cubic root of 2521404243 is about 1361.0711434166.

Adding to 2521404243 its reverse (3424041252), we get a palindrome (5945445495).

The spelling of 2521404243 in words is "two billion, five hundred twenty-one million, four hundred four thousand, two hundred forty-three".