561222120 has 32 divisors (see below), whose sum is σ = 1683666720. Its totient is φ = 149659200.

The previous prime is 561222119. The next prime is 561222121. The reversal of 561222120 is 21222165.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (561222119) and next prime (561222121).

It is not an unprimeable number, because it can be changed into a prime (561222121) 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, 2338306 + ... + 2338545.

It is an arithmetic number, because the mean of its divisors is an integer number (52614585).

Almost surely, 2^561222120 is an apocalyptic number.

It is an amenable number.

561222120 is an abundant number, since it is smaller than the sum of its proper divisors (1122444600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561222120 is a wasteful number, since it uses less digits than its factorization.

561222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676865 (or 4676861 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 561222120 is about 23690.1270574896. The cubic root of 561222120 is about 824.8562320645.

Adding to 561222120 its reverse (21222165), we get a palindrome (582444285).

The spelling of 561222120 in words is "five hundred sixty-one million, two hundred twenty-two thousand, one hundred twenty".