1812743012521 has 16 divisors (see below), whose sum is σ = 2193646216320. Its totient is φ = 1462331024640.

The previous prime is 1812743012473. The next prime is 1812743012527. The reversal of 1812743012521 is 1252103472181.

It is a cyclic number.

It is not a de Polignac number, because 1812743012521 - 2¹⁷ = 1812742881449 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812743012527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3466270 + ... + 3954808.

It is an arithmetic number, because the mean of its divisors is an integer number (137102888520).

Almost surely, 2^{1812743012521} is an apocalyptic number.

It is an amenable number.

1812743012521 is a deficient number, since it is larger than the sum of its proper divisors (380903203799).

1812743012521 is a wasteful number, since it uses less digits than its factorization.

1812743012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519744.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 1812743012521 in words is "one trillion, eight hundred twelve billion, seven hundred forty-three million, twelve thousand, five hundred twenty-one".