56002421 has 4 divisors (see below), whose sum is σ = 56209344. Its totient is φ = 55795500.

The previous prime is 56002361. The next prime is 56002459. The reversal of 56002421 is 12420065.

It is a happy number.

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 56002421 - 2⁶ = 56002357 is a prime.

It is a super-3 number, since 3×56002421³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56002393 and 56002402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56002621) 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, 103055 + ... + 103596.

It is an arithmetic number, because the mean of its divisors is an integer number (14052336).

Almost surely, 2^56002421 is an apocalyptic number.

It is an amenable number.

56002421 is a deficient number, since it is larger than the sum of its proper divisors (206923).

56002421 is a wasteful number, since it uses less digits than its factorization.

56002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206922.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 56002421 is about 7483.4765316663. The cubic root of 56002421 is about 382.5917498160.

Adding to 56002421 its reverse (12420065), we get a palindrome (68422486).

The spelling of 56002421 in words is "fifty-six million, two thousand, four hundred twenty-one".