56106621 has 16 divisors (see below), whose sum is σ = 85803520. Its totient is φ = 36197280.

The previous prime is 56106587. The next prime is 56106649. The reversal of 56106621 is 12660165.

It is a happy number.

It is not a de Polignac number, because 56106621 - 2⁷ = 56106493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56106521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32680 + ... + 34353.

It is an arithmetic number, because the mean of its divisors is an integer number (5362720).

Almost surely, 2^56106621 is an apocalyptic number.

It is an amenable number.

56106621 is a deficient number, since it is larger than the sum of its proper divisors (29696899).

56106621 is a wasteful number, since it uses less digits than its factorization.

56106621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67073 (or 67067 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 56106621 is about 7490.4353011023. The cubic root of 56106621 is about 382.8288905191.

Adding to 56106621 its reverse (12660165), we get a palindrome (68766786).

The spelling of 56106621 in words is "fifty-six million, one hundred six thousand, six hundred twenty-one".