12558783021 has 16 divisors (see below), whose sum is σ = 17249319360. Its totient is φ = 8122666880.

The previous prime is 12558783019. The next prime is 12558783043. The reversal of 12558783021 is 12038785521.

It is a cyclic number.

It is not a de Polignac number, because 12558783021 - 2¹ = 12558783019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12558783221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263190 + ... + 307223.

It is an arithmetic number, because the mean of its divisors is an integer number (1078082460).

Almost surely, 2^12558783021 is an apocalyptic number.

It is an amenable number.

12558783021 is a deficient number, since it is larger than the sum of its proper divisors (4690536339).

12558783021 is a wasteful number, since it uses less digits than its factorization.

12558783021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570636.

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 12558783021 in words is "twelve billion, five hundred fifty-eight million, seven hundred eighty-three thousand, twenty-one".