5656421321 has 8 divisors (see below), whose sum is σ = 5706057864. Its totient is φ = 5606979840.

The previous prime is 5656421317. The next prime is 5656421327. The reversal of 5656421321 is 1231246565.

It can be written as a sum of positive squares in 4 ways, for example, as 588547600 + 5067873721 = 24260^2 + 71189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5656421321 - 2² = 5656421317 is a prime.

It is a super-3 number, since 3×5656421321³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5656421327) 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, 9791 + ... + 106811.

It is an arithmetic number, because the mean of its divisors is an integer number (713257233).

Almost surely, 2^5656421321 is an apocalyptic number.

It is an amenable number.

5656421321 is a deficient number, since it is larger than the sum of its proper divisors (49636543).

5656421321 is a wasteful number, since it uses less digits than its factorization.

5656421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97531.

The product of its digits is 43200, while the sum is 35.

The square root of 5656421321 is about 75209.1837543794. The cubic root of 5656421321 is about 1781.7519804777.

Adding to 5656421321 its reverse (1231246565), we get a palindrome (6887667886).

The spelling of 5656421321 in words is "five billion, six hundred fifty-six million, four hundred twenty-one thousand, three hundred twenty-one".