561544310443021 has 4 divisors (see below), whose sum is σ = 561544800971200. Its totient is φ = 561543819914844.

The previous prime is 561544310442991. The next prime is 561544310443033. The reversal of 561544310443021 is 120344013445165.

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 561544310443021 - 2⁵ = 561544310442989 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 (561544310443421) 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, 243542901 + ... + 245837818.

It is an arithmetic number, because the mean of its divisors is an integer number (140386200242800).

Almost surely, 2^{561544310443021} is an apocalyptic number.

It is an amenable number.

561544310443021 is a deficient number, since it is larger than the sum of its proper divisors (490528179).

561544310443021 is a wasteful number, since it uses less digits than its factorization.

561544310443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490528178.

The product of its (nonzero) digits is 691200, while the sum is 43.

Adding to 561544310443021 its reverse (120344013445165), we get a palindrome (681888323888186).

The spelling of 561544310443021 in words is "five hundred sixty-one trillion, five hundred forty-four billion, three hundred ten million, four hundred forty-three thousand, twenty-one".