540251013221 has 4 divisors (see below), whose sum is σ = 553427867244. Its totient is φ = 527074159200.

The previous prime is 540251013191. The next prime is 540251013227. The reversal of 540251013221 is 122310152045.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313852050625 + 226398962596 = 560225^2 + 475814^2 .

It is a cyclic number.

It is not a de Polignac number, because 540251013221 - 2¹⁴ = 540250996837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540251013227) 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 3 ways as a sum of consecutive naturals, for example, 6588426950 + ... + 6588427031.

It is an arithmetic number, because the mean of its divisors is an integer number (138356966811).

Almost surely, 2^540251013221 is an apocalyptic number.

It is an amenable number.

540251013221 is a deficient number, since it is larger than the sum of its proper divisors (13176854023).

540251013221 is a wasteful number, since it uses less digits than its factorization.

540251013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13176854022.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 540251013221 its reverse (122310152045), we get a palindrome (662561165266).

The spelling of 540251013221 in words is "five hundred forty billion, two hundred fifty-one million, thirteen thousand, two hundred twenty-one".