56012821 has 2 divisors, whose sum is σ = 56012822. Its totient is φ = 56012820.

The previous prime is 56012809. The next prime is 56012863. The reversal of 56012821 is 12821065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 7918596 = 6935^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 56012821 - 2¹⁵ = 55980053 is a prime.

It is a super-2 number, since 2×56012821² = 6274872232756082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56012321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28006410 + 28006411.

It is an arithmetic number, because the mean of its divisors is an integer number (28006411).

Almost surely, 2^56012821 is an apocalyptic number.

It is an amenable number.

56012821 is a deficient number, since it is larger than the sum of its proper divisors (1).

56012821 is an equidigital number, since it uses as much as digits as its factorization.

56012821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 56012821 is about 7484.1713636180. The cubic root of 56012821 is about 382.6154315774.

Adding to 56012821 its reverse (12821065), we get a palindrome (68833886).

The spelling of 56012821 in words is "fifty-six million, twelve thousand, eight hundred twenty-one".