56224211621 has 2 divisors, whose sum is σ = 56224211622. Its totient is φ = 56224211620.

The previous prime is 56224211581. The next prime is 56224211629. The reversal of 56224211621 is 12611242265.

56224211621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53158374721 + 3065836900 = 230561^2 + 55370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56224211621 is a prime.

It is a super-2 number, since 2×56224211621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56224211629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28112105810 + 28112105811.

It is an arithmetic number, because the mean of its divisors is an integer number (28112105811).

Almost surely, 2^56224211621 is an apocalyptic number.

It is an amenable number.

56224211621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56224211621 is an equidigital number, since it uses as much as digits as its factorization.

56224211621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

Adding to 56224211621 its reverse (12611242265), we get a palindrome (68835453886).

The spelling of 56224211621 in words is "fifty-six billion, two hundred twenty-four million, two hundred eleven thousand, six hundred twenty-one".