56521330 has 16 divisors (see below), whose sum is σ = 102129984. Its totient is φ = 22521520.

The previous prime is 56521291. The next prime is 56521331. The reversal of 56521330 is 3312565.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 56521295 and 56521304.

It is not an unprimeable number, because it can be changed into a prime (56521331) 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, 8116 + ... + 13375.

It is an arithmetic number, because the mean of its divisors is an integer number (6383124).

Almost surely, 2^56521330 is an apocalyptic number.

56521330 is a deficient number, since it is larger than the sum of its proper divisors (45608654).

56521330 is a wasteful number, since it uses less digits than its factorization.

56521330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21761.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 56521330 is about 7518.0669057943. The cubic root of 56521330 is about 383.7697956522.

Adding to 56521330 its reverse (3312565), we get a palindrome (59833895).

The spelling of 56521330 in words is "fifty-six million, five hundred twenty-one thousand, three hundred thirty".