540012221521 has 8 divisors (see below), whose sum is σ = 544816909800. Its totient is φ = 535207986432.

The previous prime is 540012221491. The next prime is 540012221531. The reversal of 540012221521 is 125122210045.

It can be written as a sum of positive squares in 4 ways, for example, as 6982273600 + 533029947921 = 83560^2 + 730089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 540012221521 - 2⁷ = 540012221393 is a prime.

It is a super-2 number, since 2×540012221521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540012221531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2559571 + ... + 2762503.

It is an arithmetic number, because the mean of its divisors is an integer number (68102113725).

Almost surely, 2^540012221521 is an apocalyptic number.

It is an amenable number.

540012221521 is a deficient number, since it is larger than the sum of its proper divisors (4804688279).

540012221521 is a wasteful number, since it uses less digits than its factorization.

540012221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226595.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 540012221521 its reverse (125122210045), we get a palindrome (665134431566).

The spelling of 540012221521 in words is "five hundred forty billion, twelve million, two hundred twenty-one thousand, five hundred twenty-one".