540356512821 has 16 divisors (see below), whose sum is σ = 751915547136. Its totient is φ = 344522376176.

The previous prime is 540356512819. The next prime is 540356512831. The reversal of 540356512821 is 128215653045.

It is a cyclic number.

It is not a de Polignac number, because 540356512821 - 2¹ = 540356512819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540356512811) 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, 143775 + ... + 1049468.

It is an arithmetic number, because the mean of its divisors is an integer number (46994721696).

Almost surely, 2^540356512821 is an apocalyptic number.

It is an amenable number.

540356512821 is a deficient number, since it is larger than the sum of its proper divisors (211559034315).

540356512821 is a wasteful number, since it uses less digits than its factorization.

540356512821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199832.

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 540356512821 in words is "five hundred forty billion, three hundred fifty-six million, five hundred twelve thousand, eight hundred twenty-one".