512540040421 has 16 divisors (see below), whose sum is σ = 540498659328. Its totient is φ = 485302060800.

The previous prime is 512540040401. The next prime is 512540040437. The reversal of 512540040421 is 124040045215.

It is a cyclic number.

It is not a de Polignac number, because 512540040421 - 2¹³ = 512540032229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 512540040421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512540040401) 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, 4773951 + ... + 4880131.

It is an arithmetic number, because the mean of its divisors is an integer number (33781166208).

Almost surely, 2^512540040421 is an apocalyptic number.

It is an amenable number.

512540040421 is a deficient number, since it is larger than the sum of its proper divisors (27958618907).

512540040421 is a wasteful number, since it uses less digits than its factorization.

512540040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109572.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 512540040421 its reverse (124040045215), we get a palindrome (636580085636).

The spelling of 512540040421 in words is "five hundred twelve billion, five hundred forty million, forty thousand, four hundred twenty-one".