561321420 has 72 divisors (see below), whose sum is σ = 1727593392. Its totient is φ = 136076160.

The previous prime is 561321289. The next prime is 561321461. The reversal of 561321420 is 24123165.

It is a super-3 number, since 3×561321420³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31399 + ... + 45918.

Almost surely, 2^561321420 is an apocalyptic number.

It is an amenable number.

561321420 is an abundant number, since it is smaller than the sum of its proper divisors (1166271972).

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

561321420 is a wasteful number, since it uses less digits than its factorization.

561321420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77351 (or 77338 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 561321420 is about 23692.2227745731. Note that the first 3 decimals coincide. The cubic root of 561321420 is about 824.9048779218.

Adding to 561321420 its reverse (24123165), we get a palindrome (585444585).

The spelling of 561321420 in words is "five hundred sixty-one million, three hundred twenty-one thousand, four hundred twenty".