561216021323 has 4 divisors (see below), whose sum is σ = 562417769160. Its totient is φ = 560014273488.

The previous prime is 561216021307. The next prime is 561216021341. The reversal of 561216021323 is 323120612165.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 561216021323 - 2⁴ = 561216021307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561216021323.

It is not an unprimeable number, because it can be changed into a prime (561216023323) 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, 600873218 + ... + 600874151.

It is an arithmetic number, because the mean of its divisors is an integer number (140604442290).

Almost surely, 2^561216021323 is an apocalyptic number.

561216021323 is a deficient number, since it is larger than the sum of its proper divisors (1201747837).

561216021323 is a wasteful number, since it uses less digits than its factorization.

561216021323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201747836.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 561216021323 its reverse (323120612165), we get a palindrome (884336633488).

The spelling of 561216021323 in words is "five hundred sixty-one billion, two hundred sixteen million, twenty-one thousand, three hundred twenty-three".