56028138484421 has 2 divisors, whose sum is σ = 56028138484422. Its totient is φ = 56028138484420.

The previous prime is 56028138484363. The next prime is 56028138484489. The reversal of 56028138484421 is 12448483182065.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55005584730625 + 1022553753796 = 7416575^2 + 1011214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56028138484421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56028138486421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28014069242210 + 28014069242211.

It is an arithmetic number, because the mean of its divisors is an integer number (28014069242211).

Almost surely, 2^{56028138484421} is an apocalyptic number.

It is an amenable number.

56028138484421 is a deficient number, since it is larger than the sum of its proper divisors (1).

56028138484421 is an equidigital number, since it uses as much as digits as its factorization.

56028138484421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11796480, while the sum is 56.

The spelling of 56028138484421 in words is "fifty-six trillion, twenty-eight billion, one hundred thirty-eight million, four hundred eighty-four thousand, four hundred twenty-one".