539323768021 has 4 divisors (see below), whose sum is σ = 541472468544. Its totient is φ = 537175067500.

The previous prime is 539323768013. The next prime is 539323768037. The reversal of 539323768021 is 120867323935.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 539323768021 - 2³ = 539323768013 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 (539323768721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074349885 + ... + 1074350386.

It is an arithmetic number, because the mean of its divisors is an integer number (135368117136).

Almost surely, 2^539323768021 is an apocalyptic number.

It is an amenable number.

539323768021 is a deficient number, since it is larger than the sum of its proper divisors (2148700523).

539323768021 is a wasteful number, since it uses less digits than its factorization.

539323768021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148700522.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 539323768021 in words is "five hundred thirty-nine billion, three hundred twenty-three million, seven hundred sixty-eight thousand, twenty-one".