561021 has 8 divisors (see below), whose sum is σ = 765600. Its totient is φ = 365232.

The previous prime is 561019. The next prime is 561047. The reversal of 561021 is 120165.

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

It is not a de Polignac number, because 561021 - 2¹ = 561019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561061) 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, 2046 + ... + 2303.

It is an arithmetic number, because the mean of its divisors is an integer number (95700).

2⁵⁶¹⁰²¹ is an apocalyptic number.

It is an amenable number.

561021 is a deficient number, since it is larger than the sum of its proper divisors (204579).

561021 is a wasteful number, since it uses less digits than its factorization.

561021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4395.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 561021 is about 749.0133510159. The cubic root of 561021 is about 82.4757688250.

Adding to 561021 its reverse (120165), we get a palindrome (681186).

The spelling of 561021 in words is "five hundred sixty-one thousand, twenty-one".