540013021 has 4 divisors (see below), whose sum is σ = 563491872. Its totient is φ = 516534172.

The previous prime is 540012997. The next prime is 540013043. The reversal of 540013021 is 120310045.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120310045 = 5 ⋅24062009.

It is a cyclic number.

It is not a de Polignac number, because 540013021 - 2¹¹ = 540010973 is a prime.

It is a super-2 number, since 2×540013021² = 583228125699092882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 540012986 and 540013004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540013081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11739391 + ... + 11739436.

It is an arithmetic number, because the mean of its divisors is an integer number (140872968).

Almost surely, 2^540013021 is an apocalyptic number.

It is an amenable number.

540013021 is a deficient number, since it is larger than the sum of its proper divisors (23478851).

540013021 is a wasteful number, since it uses less digits than its factorization.

540013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23478850.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 540013021 is about 23238.1802428676. The cubic root of 540013021 is about 814.3318301910.

Adding to 540013021 its reverse (120310045), we get a palindrome (660323066).

The spelling of 540013021 in words is "five hundred forty million, thirteen thousand, twenty-one".