56211121 has 2 divisors, whose sum is σ = 56211122. Its totient is φ = 56211120.

The previous prime is 56211119. The next prime is 56211131. The reversal of 56211121 is 12111265.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 14930496 = 6425^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 56211121 - 2¹ = 56211119 is a prime.

Together with 56211119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56211131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28105560 + 28105561.

It is an arithmetic number, because the mean of its divisors is an integer number (28105561).

Almost surely, 2^56211121 is an apocalyptic number.

It is an amenable number.

56211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

56211121 is an equidigital number, since it uses as much as digits as its factorization.

56211121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 19.

The square root of 56211121 is about 7497.4076186373. The cubic root of 56211121 is about 383.0664192745.

Adding to 56211121 its reverse (12111265), we get a palindrome (68322386).

It can be divided in two parts, 5 and 6211121, that added together give a palindrome (6211126).

The spelling of 56211121 in words is "fifty-six million, two hundred eleven thousand, one hundred twenty-one".