56107021 has 4 divisors (see below), whose sum is σ = 59407452. Its totient is φ = 52806592.

The previous prime is 56107001. The next prime is 56107043. The reversal of 56107021 is 12070165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45414121 + 10692900 = 6739^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 56107021 - 2⁷ = 56106893 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 56106983 and 56107001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56107001) 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, 1650190 + ... + 1650223.

It is an arithmetic number, because the mean of its divisors is an integer number (14851863).

Almost surely, 2^56107021 is an apocalyptic number.

It is an amenable number.

56107021 is a deficient number, since it is larger than the sum of its proper divisors (3300431).

56107021 is a wasteful number, since it uses less digits than its factorization.

56107021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300430.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 56107021 is about 7490.4620017727. The cubic root of 56107021 is about 382.8298002821.

Adding to 56107021 its reverse (12070165), we get a palindrome (68177186).

The spelling of 56107021 in words is "fifty-six million, one hundred seven thousand, twenty-one".